>There is nothing in the spec saying to output the purchase price to the user. 

That is because such a page is not required.

`check50` is parsing your index.html page after it makes one purchase, so it should find the current value of those shares `112.00` and the updated value of cash (10000-112)  `9,888.00`

If I had to guess, I'd say that you aren't formatting your numbers in the jinja template to be formatted using `usd`  like `{{value | usd}}`