The Mn_{3}O_{4} formed on strong heating of a sample of MnSO_{4}.4H_{2}O was dissolved in 100cc of 0.1(N) FeSO_{4} containing H_{2}SO_{4}. The resulting solution reacted completely with 50cc of KMnO_{4} solution. 25cc of this KMnO_{4} solution requires 30cc of 0.1(N) FeSO_{4} solution for complete reaction. Calculate the amount of MnSO_{4}.4H_{2}O in the sample.

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