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let x = decrease 80- 80 x = 70 80(1-x) = 70 1-x =70/80 x = 1-70/80 = 0.125 = 12.5%
56/80 x 100 = 70 Therefore, 56 is 70 percent of 80.
The average is 80.
The halfway point between 70 and 80 is (70 + 80) ÷ 2 = 75