Answer:
£7
Step-by-step explanation:
Since the sale is 10% the original price, every item is being sold for 90% of its original price. Now the problem is: £6.30 is 90% of what number?
Let x = original price before sale
6.30 = 0.9x
0.9x = 6.3
Divide both sides by 0.9
x = 6.3/0.9
x = 7
Answer: £7
