Goods were bought for Rs. 600 and sold the same for Rs. 688.50 at a credit of 9 months and thus gaining 2% The rate of interest per annum is:

The true discount on Rs. 1760 due after a certain time at 12% per annum is Rs. 160. The time after which it is due is:

The true discount on a bill due 9 months hence at 16% per annum is Rs. 189. The amount of the bill is:

A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is 10% per annum, the man:

The present worth of Rs. 2310 due 2 years hence, the rate of interest being 15% per annum, is: