A man made a loan of P100,000 at a rate of 15% per annum and promise to pay it according to the f...

A man made a loan of P100,000 at a rate of 15% per annum and promise to pay it according to the following manner, P30,000 at the end of 1^st year, unknown payment at the end of 2^nd year and a final payment of P76,374.38 at the end of 4^th year. Find the unknown payment made by the man.

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