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40% = x soles
100%= 400 soles.
como resolver
40•400= 16000, luego 16000÷100 = 160, luego 400 + 160= 560
560=100%
x. =25%
560•25= 14000 luego 14000÷100 =140 luego 560 - 140 = 420 soles
2)no la entiendo