-70
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Ten percent is the same as 10/100 which is the same as 1/10.
30/1000 which is the same as 3/100 or thee hundredths.
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.
100 - 30% = 100 x (1 - (30/100)) = 100 x 0.7 = 70
30 hundreds of a dollar would be the same value as saying what is 30 cents of a Dollar, since a dollar is composed of 100 cents.