John bought a new PC. The tag in the shop said it cost £890 + VAT.

If VAT is charged at 20%, how much did he pay?

To calculate the amount John paid, we need to add the cost of the PC with the VAT charged.

Let's calculate the VAT amount first:
VAT = (20/100) x £890 = £178

Now, to find the total amount John paid, we add the cost of the PC with the VAT amount:
Total amount John paid = £890 + £178 = £1068

Therefore, John paid £1068.