what is the formula of discount percent ?

You're buying groceries in the state of Mississippi, where the sales tax is 7%. The grocery bill costs $300. How much is the total cost of the grocery bill, including sales tax?

A’s salary is increased by 10% and then decreased by 10%. The change in salary is

A number is first increased by 10% and then it is further increased by 20%. The original number is increased altogether by:

You're buying a car in the state of Massachusetts, where sales tax is 6.25%. The car costs $15,000. How much is the total cost of the car, including sales tax?

A shopkeeper offers 20% discount and still makes profit of 25%. Calculate the cost of article which has a marked price of Rs 200.

 The store price of a t-shirt is Rs 950. The successive discounts offered by the store is 30% and 50%. Calculate the total discount offered by the store. Also calculate the selling price of the t-shirt.

Namitha offers a discount of 20% on all the items at her shop and still makes a profit of 12%. What is the cost price of an article marked at Rs 280?

The printed price of a bi-cycle is $ 4200. The rate of sales tax on it is 10%. Find the price at which the cycle can be purchased.

How much per cent above the cost price should a shopkeeper mark his goods so that after allowing a discount of 25% on the marked price, he gains 20%?