Question

sandra se compro unos zapatos con el 20% de descuento si pago S/40.00 cual era el precio original (SIN DESCUENTO)

Answer 1

20% : 20/100 = 1/5

$X - \frac{1}{5}X = 40\\\\(1 - \frac{1}{5})X = 40\\\\ \frac{4}{5}X = 40\\\\ X = 50$