Two stores sell CDs in packages, as shown in the table below.CD Prices at Store ANumber of CDs in Package1122045Cost $0.70$8.40?$31.50CD Prices at Store BNumber of CDs in Package1203065Cost $0.60?$18.00$39.00If the rate at each store is constant, which statement correctly compares the cost of a package containing 20 CDs?
Answer
A
The cost at Store A is $2.00 greater than at Store B.
B
The cost at Store B is $2.00 greater than at Store A.
C
The cost at Store A is $1.00 greater than at Store B.
D
The cost at Store B is $1.00 greater than at Store A.
Explanation
At Store A, $0.70 for 1 CD means each CD costs $0.70, so a 20-CD package costs 20 × $0.70 = $14. At Store B, each CD costs $0.60, so 20 CDs cost 20 × $0.60 = $12. Store A’s package costs $2.00 more, so the correct statement is that the cost at Store A is $2.00 greater.
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