# Calculus: Help !

posted by
**Ali** on
.

The demand function for a certain brand of blank digital camcorder tapes is given by

p=−0.02x^2−0.1x+24

where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand.

Determine the consumers' surplus if the wholesale unit price is 21 dollars per tape.