The marginal cost of the 1st minute for each additional minute after 1000 minutes is at 1001st minute
What is marginal cost?
Marginal cost means the increase in cost per unit as a result of change in the number of volume of output or service.
In this case, the company would pay $50 for the first 1000 units, in other words, any number of minutes within the range of 0-1000 minutes has a fixed charge of $50, in essence, a change cost of the plan as a result of an increase of 1 minute would only take place at the 1001th minute the cost per minute then becomes variable.
Without mincing words, marginal cost for 1 minute cannot be computed at 500th minute because there is no increase then when a minute of usage is added, so also at 1000th minute.
In the same vein, the first 1minute is not at 1500th minute
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