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Area = x²
Lado incrementado = x + 0.3x = 1.3x
Area incrementada = (1.3x)² = 1.69x²
Incremento de area = 1.69x² - x² = 0.69x²
x² ------>100%
0.69x² ------> n
n = 0.69x²*100/x²
n = 69%