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  3. CIn this question, you are asked to compare the amount of Geoff’s earnings last summer not used to buy a new guitar with the amo

CIn this question, you are asked to compare the amount of Geoff’s earnings last summer not used to buy a new guitar with the amo

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答案C
解析 In this question, you are asked to compare the amount of Geoff’s earnings last summer not used to buy a new guitar with the amount $3,570. You are given that Geoff used 15% of his earnings last summer, or $630, to buy the new guitar. So the relationship between Geoff’s earnings last summer and the amount he spent to buy the guitar can be expressed by the equation
                 (0.15)×(Geoff’s earnings last summer)= $630
Therefore, you can conclude that Geoff’s earnings last summer totaled $630/0.15, or $4,200. Since Geoff earned $4,200 last summer and spent $630 of his earnings to buy the guitar, the amount he did not spend to buy the guitar was $4,200 - $630, or $3,570. Therefore, Quantity A is equal to Quantity B, and the correct answer is Choice C.
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