1. **State the problem:** We have two shops offering discounts on the same phone. We need to find which shop has the lower offer price and the difference in prices. 2. **Calculate the offer price at Low-cost Larry's:** - Original price: £90 - Discount: $\frac{1}{3}$ off, which means the phone costs $\frac{2}{3}$ of the original price. - Offer price = $90 \times \frac{2}{3} = 60$ 3. **Calculate the offer price at Markdown Market:** - Original price: £78 - Discount: 20%, so offer price = 80% of £78 - Offer price = $78 \times 0.80 = 62.4$ 4. **Compare offer prices:** - Low-cost Larry's: £60 - Markdown Market: £62.4 - Lower offer price is at Low-cost Larry's. 5. **Find the difference:** - Difference = £62.4 - £60 = £2.4 **Final answers:** - a) The phone is cheaper at Low-cost Larry's. - b) The difference in offer price is £2.4.