Others Maths Puzzle

HE DIFFERENCE BETWEEN SI AND CI FOR FOURTH YEAR IS 7280 @20% PER ANNUM. FIND PRINCIPAL

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Others Other Question

x*y=x^2 y^2 xy 1
then (1*2)*3=? What annual payment wil discharge a debt of Rs. 7620 due in 3 years at 16 2/3 % per annum compound interest?