80 + n^2
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No but 81 is a square number
Adding four percent to a number is the same as multiplying the number by 1.04. In this instance, 1.04 x 80 = 83.2. therefore, 80 increased by 4 percent is equal to 83.2.
216
take the number and multiply it by .8 like .8x100 (80 percent of 100) = 80
802 = 80 x 80 = 6400