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supongamos que el cuadrado tenga lados de 10 cm cada uno
Area = 10*10 = 100 cm²
30% = 30/100 = 0.3
10*0.3 = 3
10+3 = 13
cada lado mediría 13 cms
Area = 13*13 = 169 cm
169-100 = 69
Respuesta:
69%