On selling an article for Rs 162 there is a loss of 10%.At what price it should be sell in order to gain a profit of 10%?

The diameter of a toy wheel is 14 cm, what is the distance travelled by it in 15 revolutions? 

A and B can separately complete a piece of work in 20 days and 30 days respectively. They worked together for some time then B left the work. If A completed the rest of the work in 10 days, then B worked for how many days?

A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

Direction : What should come in place of the question (?) in the following question.

$$3{5\over7}× 4{5\over6} + ? =23{3\over4}$$

There is 40 % increase in an amount in 8 years at simple interest. What will be the compound interest  (in rupees) of Rs 30000 after 2 years at the same rate? 

Study the following graph to answer these questions :
Percent profit earned by two companies A & B over the years.
Profit = Income – Expenditure

Expenditure of Company B in years 1996 and 1997 were in the ratio of 5:7 respectively. What was the respective ratio of their incomes?