The cost of making $x$ units is $C(x) = 2x^{2} + 10x + 200$ rupees. What is the average cost per unit when 20 units are made?

Explanation

1. 01

   $C(20) = 800 + 200 + 200 = 1{,}200$ rupees.

2. 02

   Average cost $= \frac{C(20)}{20} = \frac{1{,}200}{20} = 60$ rupees per unit.