`3/4` as rate per cent is:

The ratio 2:5 as rate per cent is

As what rate of per cent, Rs. 1500 amounts to Rs. 2100 in 4 years?

Simple interest on a certain sum is frac(16)(25) of the sum. The rate per cent, if the rate per cent, and time (in years) are equal, is

At what rate per cent will a sum of Rs 4,000 yield 1,324 as compound interest in 3 years?