The relationship between the sale price of an item, S, the list price L, and the discount rate r is related by the formula S = L(1 – r). Your friend Albert bought a coat on sale for $72 that had a list price of $120. Solve for r and find the discount rate.
Answer

r = 1 – S/L, 40%

r = 1 + S/L, 60%

r = 1 – S/L, 60%

r = 1 + S/L, 40%

Question

The relationship between the sale price of an item, S, the list price L, and the discount rate r is related by the formula S = L(1 – r). Your friend Albert bought a coat on sale for $72 that had a list price of $120. Solve for r and find the discount rate.
Answer
		
r = 1 – S/L, 40%
		
r = 1 + S/L, 60%
		
r = 1 – S/L, 60%
		
r = 1 + S/L, 40%

anonymous · Answer

We have the equation 
$$S=L(1-r)$$ Divide both sides by L, and get:
$$S/L = 1-r$$ subtract 1 from both sides:
$$S/L - 1 = -r$$ Multiply both sides by -1:
$$1- S/L = r$$ Now plug in the values from the question to solve for r.

anonymous · Answer

its either a or c

anonymous · Answer

The list price is $120 and the sale price is $72. Simply plug into the equation.