Quantitative Aptitude - Arithmetic Ability Questions

Loss of 20% on selling price is equal to x% loss in cost price. What is x?

If  x = a + 1/a, y = a - 1/a, then the value of x4+y4-2x2y2

20% discount is offered on an item. By applying a promo code the customer wins 5% cash back. What is the effective discount?

The marked price of a calculator is Rs 750. It is sold at a discount of 22%. If the cost price of the calculator is Rs 500, then what is the profit (in Rs)?

Ramesh marks his article at Rs 6000 and after allowing a discount of 20%, he still earns 60% profit. What is the cost price (in Rs) of the article?

A man spend 7.5% of his money and after spending 75% of the remaining, he had Rs. 370 left. How much money did he have

When a number is increased by 24, it becomes 115% of itself. What is the number?

Excluding stoppages, the speed of a train is 120 kmph and including stoppages, it is 50 kmph. For how many minutes does the train stop per hour?