Question

The tax rate as a percent, r, charged on an item can be determined using the formula – 1 = r, where c is the final cost of the item and p is the price of the item before tax. Louise rewrites the equation to solve for the final cost of the item: c = p(1 + r). What is the final cost of a $40 item after an 8% tax is applied?
$

Answer 1

old question but will answer so this can be closed

the re-written formula c = p(1 + r) is the key to solving this problem. since it's solved for c (cost) you can simply plug in p (price before tax, or 40) and r (the tax rate, 0.08) and calculate c