B: I'm figuring out my budget.

A: What budget?

B: I'm making a shopping budget, so that I don't spend too much money.

A: How much money can you spend?

B: I can only spend $300 a month.

A: Why only $300?

B: I need to save the rest.

A: For what?

B: I need to pay my bills.

A: Your budget is a good idea.

B: I know. It's going to save me a lot of money, I hope.