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7.19: Save More Extras

Difficulty Level: At Grade Created by: CK-12
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Extra for Experts – Save More - Reason Proportionally with Percents

Buy 2 toothbrushes. Use the coupon. Which store has the better buy? How much less is the cost at that store?

Buy 4 bars of soap. Use the coupon. Which store has the better buy? How much less is the cost at that store?

Buy 4 bottles of shampoo. Use the coupon. Which store has the better buy? How much less is the cost at that store?

Solutions

1.Gem's; $0.25 less ABC's: 1 toothbrush is $5.25÷3, or $1.75, so 2 toothbrushes are $3.50 With the coupon, they are 0.5×$3.50, or $1.75 Gem's: 2 toothbrushes is half of $6.00, or $3.00 With the coupon they are 0.5×$3.00, or $1.50 $1.75$1.50=$0.25

2.ABC's; $0.28 less ABC's: 4 bars of soap are 12 of $7.20, or $3.60 With the coupon, they are 0.7×$3.60, or $2.52 Gem's: 10 bars for $10 is $1 for one bar and $4 for 4 bars With the coupon they are 0.7×$4.00, or $2.80 $2.80$2.52=$0.28

3.Gem's; $0.24 less ABC's: One bottle is $12.50÷5, or $2.50, so 4 bottles is 4×$2.50, or $10 With the coupon, the bottles are 0.6×$10, or $6.00 Gem's: One bottle is $14.40÷6, or $2.40, so 4 bottles 4×$2.40, or $9.60 With the coupon, the bottles are 0.6×$9.60, or $5.76 $6.00$5.76=$0.24

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CK.MAT.ENG.SE.1.Algebra-Explorations-K-7.7.19