A travel agent offers to convert any US dollars left over after a holiday at one of two exchange rates, as shown below.
Customers must choose which exchange rate they want to convert any leftover money with before going on holiday.
a) Hannah chose to use the premium rate. She returned from her holiday with $140. How many pounds did she receive?
b) How much less, in pounds, would Hannah have received if she had chosen the standard exchange rate?
c) Work out how many dollars Hannah would have had to return with to receive the same amount, in pounds, regardless of which exchange rate she chose
