Can anyone help me answer this?..

You see a shirt for £97, but you don't have any money.

You borrow £50 from your mum, and £50 from your dad, so you have £100.

You buy the shirt, and have £3 change.

So you give your mum £1, your dad £1 and keep the other £1.

You now owe your mum £49 and your dad £49.

£49 + £49 = £98 and your £1 makes £99.

Where is the missing £1?