First you calculate the 15% of 280:
15*280/100=42
Than, 280+42=322
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To find the number that is 15% of 280, multiply 280 by 0.15 (the equalent of 15% in decimal form). The answer is 42.
%*amount=answer .15(15%) * x = 42 thefore 42/.15= x x=280
10.25 percent of 280 .1025*280 28.7
26 percent of 280 is 72.8.
1 percent of 280 is 2.8