How much money will the students in Year 6 spend and save in a week?

You are starting of the week with a total of $15. On Monday, your teacher asks you and your classmates to bring in some dishwashing liquid and laundry detergent. Do you:

It is for a good cause! Buy them for a total of $4.

Nah... I need to save and I could spend it on something better.

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