Multiple choice general knowledge math & puzzles

A manufacturer can save x dollars per unit in production costs by overproducing in certain seasons. If storage costs for the excess are y dollars per unit per day (x > y) , which of the following expresses the maximum number of days that n excess units can be stored before the storage costs exceed the savings on the excess units?

  1. x - y

  2. (x*n)/y

  3. x/y

  4. x/(y*n)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Savings = x * n. Storage cost per day = y * n. Let d be the number of days. Storage cost = d * y * n. We want to find the maximum d such that d * y * n <= x * n. Dividing both sides by n*y gives d <= x/y.

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