Aproduct used to have a price of $20.50. it's price was then increased by 2%. additionally, a 7% tax is added when the product is purchased. what is the total cost, including tax, of purchasing the product?

the answer is d. (1.2, -4.7) on edgn

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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