Maths-

General

Easy

Question

# You can rent books at a local store for $5.00 each. An Internet company offers a flat fee of $20.00 per month for as many books as you want. How many books do you need to rent to make the online rental a better buy?

Hint:

### Total cost of renting = number of books ×Rate per book.

## The correct answer is: We need to rent more than 4 books to make the online rental a better buy.

### Step-by-step solution:-

Let the number of books to be bought in a month be x.

∴ Total cost incurred for renting at local store = Number of books * cost per book

∴ Total cost incurred for renting at local store = x × $5 ..................................................... (From given information)

∴ Total cost incurred for renting at local store = 5x ........................................................... (Equation i)

Also,

Total cost incurred on internet company for a month = $20 .................. (From given information) ..................... (Equation ii)

We need to find the number of books to be rented to make the online rental a better buy.

i.e. we need to find the value of x for which-

Cost incurred at local store > Cost incurred on online rental

∴ 5x > 20 ...................................................................................... (From Equations i & ii)

∴ x > 20/5 .................................................................................. (Dividing both sides by 5)

∴ x > 4

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