Salary of a person is first increased by 20 %, then it is decreased by 20 %. Then the percentage change in his salary is: 

Rashid borrowed Rs.15000 at the rate of 10% p.a. rate of compound interest, compound annually. He repaid a certain amount at the end of the first. Then he paid Rs. 12100 at the end of the 2nd year to completely discharge the loan. What amount did he repay at the end of 1st year?

Directions : What will come in the place of the question mark (?) in the following number series?

100  99  95  86  ? 

An aeroplan covers a certain distance at a speed of 240 km/hour in 5 hours. To cover the same distance in   $$ 1{2\over3} $$ hours it must travel at a speed of: 

The price of one eraser is Rs. 3. The value of 20 eraser is equal to the value of three Pens. The value of one pen is equal to the value of two pencils and the value of six pencils is equal to the value of five markers. What is the value of one marker?

Find the average of the following set of numbers 148, 88, 184, 166, 96, 122

Find the amount (integral value only) if a sum of ₹6,500 is being borrowed at 10% interest per annum for 2 years if interest is compounded half-yearly.

A and B can complete a work together in 48 days. A is 4 times as work efficient as B. In how many days can B alone complete the work?