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Mr. Thompson sold 4 vacuum cleaners in the first month. In the second month, he sold 3 times as many vacuum cleaners as the first month. In the third month, he sold 5 times as many vacuum cleaners as the first month.
a. How many vacuum cleaners did Mr. Thompson sell in the three months?
Mr. Thompson sold 36 vacuum cleaners in the three months.
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MONTH NUMBER VACUUMS SOLD
1 4
2 12
3 20
Total 36
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b. He sold the vacuum cleaners for $435 each. How much money did Mr. Thompson earn? Mr. Thompson earned $15,660
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Is this a question of revenue?
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c. Explain how you can use estimation to check your answer to part b.
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Methods to estimate could vary, but a very rough estimate can be:
36 vacuums at 435 dollars each,
40 vacuums at 400 dollars each (which are only approximate),
about , obviously this way giving a high estimate.