Amit started a shop by investing ₹ 5,00,000. In the first year, he incurred a loss of 5%. However, during the second year, he earned a profit of 10% which in the third year rose to 12%. Calculate his net profit for the entire period of three years.

The value of a machine depreciates 10% annually. Its present value is ₹ 64,800. Find :

(i) its value after 2 years,

(ii) its value 2 years ago.

A machine depreciates each year at 8% of its value in the beginning of the year. If its value be ₹ 57,500 at the end of the year 2015, find :

(i) its value at the end of the year 2014,

(ii) its value at the end of the year 2016.