first lets take a decimal like 0.9 it = 90 over 100 so that =90 percent
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1/10 as a precent
80%
The percent of a number is found by forming a fraction and then simplifying it to decimal form to the desired precision. For example to find what percent 3 is of 8, the fraction 3/8 is formed and simplified to 37.5 percent.
40%.
15... without using a calculator !