The diameter of the large piston of a hydraulic press is $20 \mathrm{~cm}$, and the area of the small piston is $0.50 \mathrm{~cm}^{2}$. If a force of $400 \mathrm{~N}$ is applied to the small piston, (a) what is the resulting force exerted on the large piston? (b) What is the increase in pressure underneath the small piston? ( $c$ ) Underneath the large piston?