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?