Herriot says she wants to take $$100$ from the ATM. You provide prompts to help her to press the correct keys. She is now ready to go shopping.

Herriot sees a jumper that she wants. It is bright pink and costs $$60.$ There are other jumpers on special for $$20$ not quite the same colour but still a pretty pink. The $$60$ jumper will use up most of her money.

How would you support Herriot in making her own decision about this purchase?