Tim E. answered • 11/02/15

Tutor

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Comm. College & High School Math, Physics - retired Aerospace Engr

you don't state what it's asking for, but I'll assume they want what the percent discount is.

Let D = discount (as a decimal fraction 0-1) where PCT = 100*fraction

in general, PRICE - PRICE*D = final price

rewritten PRICE*(1 - D) = final price

so Solve for D: D = 1 - (final price/PRICE)

the PCT = D*100

Abe's Total before discount: $75 and the final price was $56.25

so D = 1 - (56.25/75) = 0.25 ........... SO PCT = 100*0.25 = 25% (Abe's discount)

so D = 1 - (56.25/75) = 0.25 ........... SO PCT = 100*0.25 = 25% (Abe's discount)

Barb's Total before discount: $52 and the final price was $31.20

so D = 1 - (31.20/52) = 0.40 ............SO PCT = 100*0.40 = 40% (Barb's discount)

so D = 1 - (31.20/52) = 0.40 ............SO PCT = 100*0.40 = 40% (Barb's discount)