I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

The cost of the most expensive book which he can buy with his money is less than or equal to 43.5

Step-by-step explanation:

Given : I'm at a bookstore with $35 in my pocket and a 20%-off coupon.

To Find: . What is the cost of the most expensive book I can buy with my money and the coupon?

Solution :

let the cost of most expensive book be x

Since there is 20 % of on every book

So, After 20 % off on the most expensive

The cost will be :  x  - (x of 20%)

Since we are given that he has only $35 so he cannot pay more than 35

so, equation becomes :

So , the cost of the most expensive book which he can buy with his money is less than or equal to 43.5