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x = 10/0,004
x = 2500
Wyjaśnienia
10 USD = 0,8(80% wartości odsetek)*0,005(inny zapis 0,5%)*x(kwota wpłacona)
80% * (0,5% * x) = 10
0,8 * 0,005x = 10
0,004x = 10 || : 0,004
x = 2500
Odp.: Do banku wpłacono 2500 USD.