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MAT-144 · In-person sections Exam 1 Review · Unit 1
Exam 1 Review · Q2

Choosing between a percent discount and a flat rebate

Two offers on the same item, one a percent and one a fixed dollar amount. Convert the percent to dollars and the comparison becomes trivial.

Every step of Choosing between a percent discount and a flat rebate explained on video. Pause anywhere; the embed scrolls independently of the page.

YOUTUBE

ALEKS randomizes the numbers each attempt, but the question shape stays the same. Here are three example versions you might see.

Percent wins

A $340 jacket: 30% off or a $95 rebate.

How much more does the better offer save? Type just the number.

$
Rebate wins

A $1,250 television: 15% off or a $200 rebate.

How much more does the better offer save? Type just the number.

$
A dead tie

A $620 mattress: 20% off or a $124 rebate.

How much more does the better offer save? Type just the number.

$
Heads up: Your ALEKS version will use different numbers. The numbers in the practice below are different too — that way you're exercising the move, not memorizing one answer.
put both offers in the same unit a percent is not comparable to a dollar amount until you convert it
\(\text{discount in dollars} = \tfrac{p}{100} \times \text{price}\) then simply compare the two dollar figures
The whole question is a unit mismatch. “25% off” and “$110 back” cannot be compared as written. Turn the percent into dollars and you are comparing two numbers, which anyone can do.
Common slips
(1) Compared 25 to 110. Those are different units. (2) Answered with the final price instead of the saving. Read which one the question wants. (3) Assumed the bigger percent always wins. It depends entirely on the price: 25% of a cheap item beats nothing, and loses to a big rebate.
Same unit, then compare

A $480 bicycle has two offers.

Offer A: 25% off. Offer B: $110 mail-in rebate.

Which saves more, and by how much?

Step 1

Convert offer A to dollars

What is 25% of $480?
$
Step 2

Which is bigger?

$120 or $110? Type A or B.
Step 3

By how much?

Subtract.
$
Q1 Q3