640/392 = 80/49 = 131/49
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4/5
Convert 12.5% to decimal form and multiply it by 640. Therefore, 0.125 multiply to 640 the answer is 80.
8√10
60% of 640= 60% * 640= 0.6 * 640= 384
110% of 640= 110% * 640= 1.1 * 640= 704