WAEC Economics 2016 Question 13

The supply of rice in tons is given by the function: Qs − 80 − 0.7P = 0. Where Qs = quantity supplied P = price in Dollars ($). Find Qs, when P = $40.

1. A.108 tons.
2. B.52 tons.
3. C.−52 tons.
4. D.−108 tons.