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20240 = 80% x (20000 + x)
25300 = 20000 + x
x = 5300 - odsetki (przed odtrąceniem podatku)
K1 = 20 000 + 5 300 = 25 300
K = 20 000
p = ?
n = 1
25 300 = 20 000(1 + p) |: 20000
1 + p = 1,265
p = 0,265 = 26,5%
Odp.: 26,5%