Quantitative Aptitude - Arithmetic Ability Questions

A trader marks his goods in such a way that after allowing a discount of 10% he gains 15%. If an article costs him Rs. 720, his marked price is

The marked price of a chair is Rs 550 and a discount of 20% is given on it. What is the selling price (in Rs)?

A fraction is greater than twice its reciprocal by 7/15. What is the fraction?

In triangle PQR, C is the centroid. PQ = 30 cm, QR = 36 cm and PR = 50 cm. If D is the midpoint of QR, then what is the length (in cm) of CD?

If a cylinder of radius 4 cm and height 8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone?

If a merchant offers a discount of 40% on the list price, then he makes a loss of 10%. What % profit or % loss will he make if he sells at a discount of 20% of the list price?

What is the value of 0.55 x 4.5/0.81 ?

If a number is decreased by 10%, it becomes 54. To make it 72, it should be increased by