What is the cubic units of 2ft by 2 ft by 2ft

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

Pls! does anybody know a shortcut for answering these types of questions in the future?

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15