400 chickooes were bought at ₹1260 per hundred and were sold at a profit of ₹860. Find the selling price (in ₹) per dozen of chickooes.

When difference between compound and simple interest for three years is ₹183 at 5% interest per annum, the principal is ₹ ______________.

Evaluate: 16 + 8 ÷ 4 - 2 x 3

Abhishek and Deepanshi undertake to do a piece of work for ₹1,000. Abhishek alone can do it in 5 days and Deepanshi alone can do it in 10 days. With the help of Chitransh, they finish it in 2 days. How much should Chitransh be paid for his contribution?

Govind invested some money in HDFC at 4% per annum rate of interest. What would be the corresponding simple interest (in 7) if after 2 years, Govind got ₹178.5 as compound interest, considering annual compounding?

A man sold an article for ₹216, there by gaining 20%. The cost of the article (in ₹) was:

A washing machine is marked at ₹30,000. A customer gets two successive discounts of 20% and 10%. What is the final price (in ₹) that the customer has to pay?

Mukund invests a sum of ₹5400 and Sachin invests a sum of ₹9400 at the same rate of simple interest per annum. If, at the end of 5 years, Sachin gets ₹960 more interest than Mukund, then find the rate of interest per annum (in percentage).