What percent of 51 is 42? if necessary, round to the nearest tenth of a percent.
a)0.8%
b)45.2%
c)121.4%
d)82.4%

find the percent of decrease from 280 to 210. round to the nearest tenth of a percent if necessary.

a)133.3%
b)0.3%
c)25%
d)33.3%