the correct answer is 75%......21 is 3/4 of 28
5.88%
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49 − 28 = 21 difference 21 / 28 x 100 = 75%
The percent of decrease is the amount it has decreased by. 49-28 is 21, so set up 21/49 to x/100. Cross multiply to get 2100 = 49x, then divide both sides by 49. From this you get about 42.857, so the percent of decrease is 42.857%.
(7 percent of 21) - (4 percent of 21) = 0.63
21 percent is 21% or 21/100.
30 percent of 28 is 8.4.