If the side of a square is increased by 20% the area of the square is increased by

Two towers are 35 m and 50 m height and 20m apart on level ground. Find the length of the rope connecting their tops. 

A and B started a business investing Rs.22,500 and Rs.35,000 respectively. Out of a total profit of Rs.13,800 B's share is 

Salary of an employ increases consistenly by 50% every year. If his salary today is 10,000 Rs. What will be the salary after 4 years.