40
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let f= full marks,
200-160=40
then required %=40/f x100 ,
or if you mean you get 40 out of 200,
Then required %=40/200 x 100=20%
12 is 7.5% of 160.
128
% rate = 160% = 128/80 * 100% = 1.6 * 100% = 160%
160%= 160/100 or 8/5 in fraction
20 / 200 = 0.10 20 is 10 percent of 200.