Quantitative Aptitude - Arithmetic Ability Questions

A dealer marks his goods 20% above their cost prices. Then,he allows such a discount on the marked price so that he makes a profit of 8%. The rate of discount is:

Ram Naresh got two successive discounts, a bag with a list price of Rs.400 is available at Rs. 160. If the second discount is 20%, find the first discount.

If x+1x:x-1x=5:3 then the value of x is

What is the unit digit of the sum of first 111 whole numbers?

A runner starts running from a point at 6:00 am with a speed of 8 km/hr. Another racer starts from the same point at 8:30 am in the same direction with speed of 10 km/hr. At what time of the day (in p.m.) will the second racer will overtake the other runner?

If 2 pair of trouser is offered free on purchase of 3 pair of trousers priced Rs 900 each what is the effective discount on each pair of trouser?

A book is sold at three successive discounts of 20%, 20% and 10%. What is the net discount (in percentage)?

Find the standard deviation of {11, 7, 10,13, 9}