Riya gets ₹200 pocket money at the start of the month and spends all of it in the first we

Riya gets ₹200 pocket money at the start of the month and spends all of it in the first week on stickers and snacks. In the third week, she wants a ₹150 pencil box, but she has no money left. She says she should still be able to buy it because "it's still the same pocket money month." Her friend Zoya disagrees. Who is right?