Test Preparation on Math Test Preparation Problems on Profit And Loss Part 2

By selling an article for Rs. 10. Then, the gain percent is:

There would be a 10% loss if a toy is sold at Rs. 10.80 per piece. At what price should it be sold to earn a profit of 20%?

What is the cost of an article which is sold at a loss of 25% for Rs. 150?

The cost of 2 T.V. sets and radio is Rs. 7000, while 2 radios and one T.V. set together cost Rs. 4250. The cost of a T.V. set is: