3.4. Cumulative Usage and Costs per Hour

So, basically that is what is this economic life. Economic life means it is a time during which the cost of holding the machine will be minimum. So, beyond the economic life you can see that there will be increasing costs associated with the machine, either due to increase in the operating cost that is repair and the maintenance costs or increase in downtime costs or increasing obsolescence cost.

The economic life of a machine refers to the duration during which it operates efficiently with minimal holding costs. Once this time is exceeded, costs related to maintenance, repair, downtime, and obsolescence begin to rise, making it financially unwise to keep the machine in operation. Thus, businesses should consider replacing old machines to avoid incurring losses.

Think of a personal vehicle: you buy a new car that runs smoothly and requires minimal repairs for the first few years. As it ages, repair costs increase, the car may spend more time in the shop, and it might not be as efficient in fuel consumption. Eventually, keeping the old car becomes more expensive than purchasing a new one, similar to the economic life of machines.

In this example, we are going to see how to estimate the economic life of the machine. So, basically, here we are going to estimate economic life for a track mounted front shovel. The purchase price is 35,00,000. So, the machine is expected to last for 8 useful years and the depreciation is assumed to follow double declining balance method.

This example illustrates how to compute the economic life of a specific piece of equipment, in this case, a track mounted front shovel. The machine costs 3,500,000 Rupees, is expected to be usable for eight years, and will depreciate in value using the double declining balance method, a common approach to account for rapid initial loss in value.

Imagine you buy a new laptop for 3,500 Rupees that you expect to use for eight years. In the first few years, its value drops significantly because new models arrive, similar to how machinery depreciates. Tracking this helps you decide when it's time to invest in a new laptop.

Due to inflation, you can see that annual increase of the average cost of the equipment is approximately 6%. That means the machine cost is going to increase by 2,10,000 every year, due to the effect of inflation.

Inflation affects the purchasing power of money over time, leading to increases in the cost of machinery and related equipment. In this case, the equipment's cost will rise by around 210,000 Rupees each year, increasing the financial burden on the operator and influencing decisions about replacement.

Consider how a simple grocery item, like bread, has increased in price each year due to inflation. Just as you may find yourself spending more on bread over the years, businesses must recognize that machinery will also cost more to replace as time goes on.

So, now let us work out the cost associated with the machine from the replacement analysis perspective. As I told you, we are supposed to consider all the components of the cost associated with the machine, so that you can have an accurate estimation of the optimum replacement time.

When analyzing replacement costs, it is crucial to take into account all associated expenses, including depreciation, maintenance, and repair costs. This comprehensive understanding allows for more accurate predictions of when to replace the machinery to maximize efficiency and minimize expenses.

Think of planning a long road trip: you would consider the fuel cost, food expenses, lodging, and tolls beforehand. Just as you need to combine these costs to determine your total budget for the trip, companies must aggregate all relevant costs to understand when to replace their machines.

At the end of the first year, if you wanted to replace the particular machine, the increase in the cost will be 2,10,000 compared to the initial purchase price. This calculation is critical for determining the loss associated with replacement.

To evaluate the need for replacement, costs are compared at their original price plus increments due to inflation. Tracking these changes helps identify losses associated with keeping older equipment versus replacing it with a new model.

Just like a smartphone, if you wait too long to upgrade, you may find the new model has dramatically increased in price due to demand and advancements. This can leave you at a loss if you let your current model depreciate too much.

Now, you find the cumulative use of the machine every year you know the machine is being used for 2000 hours. The annual usage of machine every year is 2000 hours.

Cumulative usage refers to the total hours a machine has been operational over time. For example, if the machine is used for 2000 hours each year, by year five, the cumulative usage would be 10,000 hours, which is essential for understanding how wear and tear affects costs.

If you use a rental bicycle for 2000 hours each year, after five years, you will have ridden it for 10,000 hours. Each additional hour adds stress to the bike, similar to how prolonged machinery usage impacts future maintenance and repair needs.

So, I will explain the reason later. Now, you find what is the cumulative cost per hour? Cumulative cost per hour is nothing but the cumulative cost on replacement.

Calculating the cumulative cost per hour involves dividing the total cumulative costs by the hours the machine has been utilized. This provides a better understanding of how efficient the investment in machinery is over time, as costs are spread across a larger number of operating hours.

Similar to calculating how much you spend per meal when cooking at home versus dining out frequently, understanding the cumulative cost per hour gives you insights into how effectively you're utilizing your machinery.

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