How do you estimate by using 10%/ 12% of 77?
Are you trying to find 12 percent of 77 by estimating? If so, you do this by using 10% of 77 to estimate, since it is easy to figure and very close to 12%. 10% of any number is that number multiplied by 0.10. 77 times 0.10 is 7.7. Therefore 12% of 77 is about 7.7 or you could safely round that up to 8.
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