For the following questions answer them individually
A person covers a certain distance by bullet train at 84 km/h and returns back to the starting point by bus at a speed of 66 km/h. Find the average speed of the person for the whole journey.
If a shopkeeper wants to give 20% discount on the cost price of the article, then he has to sell it for Rs.400. If he sells it at Rs.520, then his gain percentage is:
Mohan buys a chair at Rs.1,200. If he sells it at Rs.1,440, then what is the profit percentage?
If the curved surface area of a solid right circular cylinder of height h and radius r is one-third of its total surface area, then:
Manish can do a piece of work in 7 days while Anil can do the same piece of work in 6 days. The wage for full work is Rs. 390, If they both work together to complete the work, then find the earnings of Manish.
The ratio of expenditure to saving of a person is 7:3. If the income increases by 12% and the expenditure increases by 8%, then by what percentage his savings will increase? (Correct to 2 decimal places)
Kunal bought an article and sold it at a loss of 15%. If he had bought it for 18% less and sold it for ₹108 more, then he would have had a profit of 30%. Find the cost price of the article.
A bag contains 50 kg of pulses. There are three pulses, A, B, and C, mixed in it in the ratio of 4 : 3 : 3. The prices of pulses A, B, and C are ₹80 per kg, ₹60 per kg and ₹80 per kg respectively. What will be the average cost of 1 kg mixture of pulses?