Can you work out where my missing pound is? A house point to the first person who solves my riddle. Mr F 🙂

You see a £97 t-shirt but you don’t have any money, so you borrow £50 from Mum and £50 from dad = £100. You buy the t-shirt and get £3 change then decide to give mum £1 and Dad £1 and keep the other £1 for yourself. You now owe Mum £49 and Dad £49 so 49+49 = £98 and your £1 makes £99 … Where is the missing £1?