Question

The shopkeeper agrees to give him a total discount of $70, but charges $9 for every pen. what is the maximum number of pens he can buy now?

Answer 1

If the total cost is $110, the maximum number of pen he can buy is 20

How to determine the maximum number of pen?

Let the number of pen be p.

So, the cost is represented as:

Cost = Rate * number of pen - Total discount

This gives

Cost = 9 * p - 70

Evaluate the product

Cost = 9p - 70

Let the total cost be 110.

So, we have:

9p - 70 = 110

Add 70 to both sides

9p = 180

Divide both sides by 9

p = 20

Hence, the maximum number of pen he can buy is 20

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