An equipment costs Rs.25000 to purchase now. It will be used continuously for 8 years. At the end, its salvage value is estimated to be Rs.1600. Its residual book value at beginning of the 6th year of its use, by the straight line method of depreciation is

A certain sum of money at simple interest amounts to Rs.1020 in 2(1/2) years and to Rs. 1067.20 in 4 years. The rate of interest per annum is:

In a sale, a perfume is available at a discount of 15% on the selling price. If the perfume’s discounted selling price is Rs.3675.40, what was the original selling price of the perfume?