Given a Consumer's Demand Function $D ( q ) = \frac { 300 } { 0.4 q + 8 }$

Multiple Choice

Given a consumer's demand function, $D ( q ) = \frac { 300 } { 0.4 q + 8 }$ dollars per unit,find the total amount of money consumers are willing to spend to get 15 units of the commodity.

A) $419.71
B) $0.56
C) $167.88
D) $209.86