A Trough Whose Cross-Section Is a Trapezoid Whose Lower Base $3,000$

Multiple Choice

A trough whose cross-section is a trapezoid whose lower base is 4 feet long, upper base is 8 feet long, and is 4 feet high is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

A) $3,000$
B) $\frac { 8,000 } { 3 }$
C) $2,250$
D) $1,000$
E) 950