50
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It is: 30 feet Check: 30+30+20+20 = 100 feet
66.67%% rate:= 20/30 * 100%= 0.6667 * 100%= 66.67%
(20 + 30)/2 = 25
percent increase = 50% % increase =|original value - new value|/original value * 100% = |20 - 30|/20 * 100% = 10/20 * 100% = 0.50* 100% = 50%
30% = 30/100 30% of 150 = (30/100)x150 = 45