A jewelry store sells 224 diamond bracelets per month at $600 each. The owners estimate that for each $60 increase in price, they will sell 7 fewer diamond bracelets per month. Find the price per diamond bracelet that will maximize revenue.

17.08

correct me if i am wrong.

21

jk it's 20

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15