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 and upper base is 6 feet long, and is 1 foot 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) $\frac { 500 } { 3 }$
C) $\frac { 875 } { 6 }$
D) $1,000$
E) $2,250$