Since 4% = 4/100, we get:
4/100 * 40 = 1/25 * 40 = 1/5 * 8 = 8/5 = 1.6.
OR, since 4%=.04 multiply it by 40 and the answer is 1.6 .
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100 percent is 1 40 percent is .4 4 percent is .04
40%= .4 or .40
4/40 = 0.1 = 10%
4% of 40kg= 4% * 40= 0.04 * 40= 1.6kg
%rate: =(4/40) x 100% = 10%