ratio = 70% : 30 % = 7 : 3
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70 - 30% = 49
21 is 30% of 70
30 percent 'off' leaves 70 percent 'on'.70 percent of 199.99 = (0.7 x 199.99) = 139.993
To find 21 percent of a number, multiply the number by 0.21. In this instance, 0.21 x 70 = 14.7. Therefore, 21 percent of 70 is equal to 14.7.
30% off of 15.00 dollars = (100-30)% of 15 dollars = 70 percent of 15.00 dollars = 15.00*70/100 = 10.50 dollars