220/100 = 22/10 so the answer is 22.
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6.66666667
5 to 100, 5%
30/100 divide both, numerator and denominator of the fraction, by the same number, 10. = [30 over 10]/[100 over 10] = 3/10 so three tenths.
Seven tenths of 100 = 100*7/10 = 70
220 - 2.2 = 217.8