Problem: Michael and Kasim went shopping for a
laptop for school. The cost of the laptop they wanted
to purchase was $1,400. They each have a coupon
to use on the purchase. One coupon will discount
$150 off and the second coupon that will discount
8% off the price. Michael and Kasim are trying to
figure out how they can get the better deal. Here are
their options:
Option 1: Take $150 off the original price, then take
8% off the discounted price.
Option 2: Take 8% off the original price, then take
$150 off the discounted price.
Which is the better deal?
Option 1
Option 2
$1,400 $150 = $1,250
$1,400 x 0.8 $1,120
$1,250 x 0.8 = $1,000
$1,120-$150 = $970
$1,250 $1,000 = $250
Price of laptop $250
Price of laptop $970
Student Answer: Option 1
What mistake(s) did the student make?
the mistake was
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