Buy, Exchange, Sell
£50 was sold for 50 pence through a series of consecutive, decremental transactions.
A group of pre-determined items were gathered in an exchange store.
The most expensive item at £50 was bought first. It was then exchanged
straight away for its value of £30. This was then used to buy the next
item at £30, which was then exchanged for its value of £18. This process continued until the purchase of the final item at £2 which was then sold
for 50p cash.