Harry needs dollars to go on holiday - OCR - GCSE Maths - Question 9 - 2017 - Paper 1

First, we need to determine the exchange rate based on the information given. Harry can buy $50 for £40, which gives us the following exchange rate:

ext{Exchange Rate} = rac{40}{50} = 0.8 ext{ pounds per dollar}

Now, to find out how much $720 costs, we multiply the amount in dollars by the exchange rate:

$$ext{Cost} = 720 imes 0.8 = 576 ext{ pounds}$$

Thus, $720 will cost £576.