The pie chart below represents the instruments played by students of a school. Read the chart and answer the following questions based on it.

The sector angle corresponding to the Violin is 

The MRP of a watch is Rs.4750. The shop sells it at 12% discount. If the shopkeeper had purchased the watch for Rs. 3,850, what is his gain? 

Selling price of an article is $${7\over6}$$ of cost price. What is the profit percentage?

What is single discount equivalent to two successive discounts of 15% and 20%?

Radius of base of a right circular cone and a sphere is each equal to r. if the sphere and cone have same volume, the what is the height of the cone?

The average of 12 number is 42. If a 13th number is added, then the average becomes 44. What is the 13th number?

By selling an article for Rs. 320, a man incurs a loss of 20%, what should be the selling price of an article to gain 30%?

Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 10 hours – pipe A, B, C together can fill the same tank in 12 hours. In how many hours pipe C can fill the tank alone?