A solid has its base in the region under the curve y=g(x) on 0≤x≤5. Squares are erected perpendicular to the x–axis, and the side length of each square is kg(x), where k>0 is a constant. The volume of the solid is V when k=1. What is the volume when k=3?
a) 9V
b) 3V
c) 27V
d) 6V