All CD's are on sale for 20% this week. The CD is $9.99. Write a proportion to solve for the price of the original CD.

what was there favorite food

$119.20

step-by-step explanation:

$372.50 - 60% off is $149. $149-20% off is $119.20

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).