Answer :

For first year interest, we have


p1 = 4000, R1 = 18% and T1 = 3year


I1 =


=


= 2160


For second year


P2 = 12000-4000 = 8000, R2 = 15% and T2 = 3year


I2 =


=


= 3600


Hence, after 3 year total interest = I1 + I2 = 2160 + 3600


= 5760


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