By what per cent is the sum of Rs. 100 more than the sum of Rs. 90?

By what per cent is the sum of Rs90 by 11 .(1)/(9) %

What per cent is Rs. 4500 of Rs. 5000?

By what per cent is Rs. 2,000 less than Rs. 2,400 ?

The simple interest on a certain sum for 8 years at 12 per cent per annum is Rs. 3120 more than the simple interest on the same sum for 5 years at 14 per cent per annum. Find the sum.

At what rate per cent per annum will Rs. 6300 yield an interest of Rs. 2100 in 4 years?

By what per cent is Rs 2,000 less than Rs 2,400? Is it the same as the per cent by which Rs 2,400 is more than Rs 2,000?

At what rate per cent per annum will a sum of Rs. 1,000 amount to Rs. 1,102.50 in 2 years at compound interest?

At what rate per cent per annum will Rs. 630 produce an interest of Rs. 126 in 4 years ?