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Parte/total *100%
(600/800)100%
= (3/4)100%
=75%
3)
8800-(7.5/100)(8800)
=8140
5)
80 =(x + 15x/100)
80 = 23x/20
x=69.434
7)
280 = PV(1+12/100)
280 = PV(28/25)
PV = 250 soles
Ya te ayude los problemas impares de manera similar se resuelven los demas