Answer: £494.12
Explanation:
Let the original price be x.
15% of the original price = 15/100 * x = 0.15x
Now, according to the problem,
Selling price of computer = £420
After a 15% reduction,
The selling price of the computer = 85% of the original price
= 85/100 * x
= 0.85x
Therefore,
0.85x = 420
x = 420/0.85
x = 494.12
Therefore, the original price of the computer before the reduction was £494.12.