Final answer:
Stacey needs to work at least 28 hours at £8 per hour to earn enough to buy a new phone costing £220.
Step-by-step explanation:
To determine how many hours Stacey needs to work to earn enough to buy a new phone costing £220, we simply divide the cost of the phone by her hourly wage. Stacey earns £8 an hour, so we perform the following calculation: £220 ÷ £8 = 27.5 hours. Since Stacey cannot work a fraction of an hour, she will need to work at least 28 hours to earn enough money to purchase the phone. This is a basic mathematical calculation involving division.