Basic mental arithmetic !... 10% is 210 - therefore 30% is 610 dollars !
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30 percent of 70 dollars will be approximately $21 US dollars.
30% of $120 Soln: 30/100 × 120 12 ×3= $36
30% of 400 dollars = 400 dollars * 30/100 = 120 dollars.
30 % of 70 dollars = (30 / 100) * 70 = 21 dollars
30% of 1600 dollars = 1600 dollars*30/100 dollars = 480 dollars.