First, use front end rounding to estimate each answer. Then find the exact answer.John's current salary is , but he expects to be earning  within three years. If things turn out as John expects, how much more will he be earning in three years?

A. estimate: $40,000 - $29,100 = $10,900; exact: $40,000 - $29,188 = $10,812
B. estimate: $40,000 - $29,000 = $11,000; exact: $40,000 - $29,188 = $10,812
C. estimate: $40,000 - $30,000 = $10,000; exact: $40,000 - $29,188 = $10,812
D. estimate: $40,000 - $28,900 = $11,100; exact: $40,000 - $29,188 = $10,812


Answer: C

Mathematics

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