It's 21 Dollars.
70 * 0.30 (0.3 = 30%) = 21
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70 percent of 60 dollars = 42 dollars.
96 dollars - 30% = 70% of 96 dollars = 96*70/100 = 67.20 dollars.
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars
30% off 372 dollars = 70% of 372 dollars = 372*70/100 = 260.40 dollars
30% off 30000 dollars = 70% of 30000 dollars = 30000*70/100 = 21000 dollars.