Most of the pencils which I own have no metal at the end.
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20% of 20% is 4% (=0.04)
7 of out 20 in percent is (7/20)*100 = 35 percent.
20 percent of 42 = 8.4
40% x * 20 = 8 divide both sides by 20 end up with .4 as your answer. multiply * 100 = 40 %
20 percent is lower than 30 percent.