Maths Series Questions with Answers

A principal increase by 50 percent in five years at the rate of simple interest. What will be the compound interest for 3 years at Rs 20,000 with the same interest rate?

The simple interest on an amount at the rate of 7 percent for five years is Rs 700. So how much is the principal?

There are four different bags. Also, there are four different coins. In how many ways can the coins be put into bags if there are exactly two coins in exactly one of the bags?

If four coins are tossed together, what is the probability of at least getting 2 heads?

When a mobile is sold at 6 percent profit, it gets Rs. 870 more than it is sold at 6 percent loss. So what is the purchase price of mobile?