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Cf = 7000
Ci = 5000
t = 10 años
i = ?
Cf=Ci(1+i)^t
7000 = 5000(1+i)^10
(1+i)^10
1,4 = (1+i)^10
z = 1+i
1,4 = z^10
log 1,4 = 10 log z
log z = (log 1,4)/10
log z = 0,0146
z = 1,034219
Pero z = 1+i
1,034219 = 1+i
i = 1,034219 - 1
i = 0,034219 → r = 3,42%