A photocopy machine is purchased for Rs. 80,000. After using for 2 years, only Rs. 30,000 is earned. The price of machine depreciates annually at the rate of 20% and the machine is sold after 2 years.

a)The initial price of machine is Rs. Vo, annual rate of compound depreciation is R% and the price of machine after T years is Rs. Vr, express VT in terms of Vo, R% and T.
b)Find the selling price of the machine after 2 years.
c)Find the total profit or loss in percentage on selling the machine.

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