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A percentage is a proportion. It is telling you a proportion per 100. 100 percent means 100 out of every 100. 15 percent means 15 out of every 100.
If you are increasing something by 15% then the new value is 115% of the original value. 115% means 115 out of every 100 = 115/100 = 1.15. So if we multiply the original figure by 1.15 we will have our answer.
790 * 1.15 = 908.5
An alternate method (requiring two steps rather than one) is to first calculate 15% of the figure and then add the result to the figure. 15% of 790 is 15/100 * 790 = 0.15 * 790 = 118.5. 118.5 + 790 = 908.5
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