You see a shirt for £97

You don't have the cash , so you borrow £50 from your mum and £50 from your dad

£50 + £50 = £100

You buy the shirt and have £3 change

You give your mum £1 and your dad £1 and you keep the other £1

Now you owe your mum £49 and your dad £49

£49 + £49 + my £1 = £99

So where the is the missing £1 ….

It was a restaurant bill last time I heard his.. Does play with the head, but...
97+1+1+1=100
Or
97 +1 in your pocket = 98 + 1 for mum + 1 for dad = 100
Or
Now due them 98, which is 97 shirt +1 in pocket..

Seeeeeeeemples. Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI