Question

George has these two options for contact lenses. Option A £108 for 90 pairs. Option B £1.15 each pair. George wants to buy 90 pairs of contact lenses. He wants to pay as little as possible. Which option should George use?

Answer 1

Hello!

To solve this exercise, we have to calculate the cost of each option. Let's do it:

Option A)

• £108 for 90 pairs

Let's make a division to calculate the cost of each pair of contact lenses:

`(108)/(90)=\pounds1.20\text{ each pair}`

Option B)

£1.15 for each pair

Let's multiply to obtain the total cost of buying 90 pairs:

`\pounds1.15\cdot90=\pounds103.50`

As we can see, George should use option B because it's cheaper than option A.