Question 991207
The sale Price S (in dollars) of an item is given by the formula S=L - rL, where L is the list price (in dollars) and r is the discount rate (in decimal form) 
a. Solve the formula for r
S = L - rL
rL = L-S
r = (L-S)/L = 1 - (S/L)
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b. The list price of the shirt is $30. What is discount rate?
r = 1 - (S/30)


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Cheers,
Stan H.