Kameron paid $3.60 for a book. It was marked down 50% of its original price, and he also used a coupon to save an additional 40% off of the sale price. What was the original price?

the original price of the book is $12

Step-by-step explanation:

Let x represent the original price of the book.

It was marked down 50% of its original price. This means that the amount by which the original price was reduced is

50/100 × x = 0.5 × x = 0.5x

The sale price would be

x - 0.5x = 0.5x

He also used a coupon to save an additional 40% off the sale price. This means that the value of the applied coupon is

40/100 × 0.5x = 0.2x

The amount that he would pay for the book is

0.5x - 0.2x = 0.3x

If Kameron paid $3.60 for a book, it means that

0.3x = 3.6

x = 3.6/0.3

x = $12

she will most likely have 33  

step-by-step explanation:

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).