दीप्ति को साधारण ब्याज पर सालाना 300 रुपये का नुकसान होता है जब ब्याज की दर 1212% से घटकर 1012% हो जाती है। दीप्ति द्वारा निवेश की गई राशि है:

A sum becomes 2215 of itself in 6 years at simple interest. Find the rate of interest per annum.

In how many years will a sum of ₹5,500 amount to ₹6,600 at a simple interest rate of 5% per annum?

A sum of money amounts to ₹16000 in 6 years at simple interest of 25 percent per annum. What will be the total interest for 6 years?