Not a bad deal if you want to get a cheap lunch.
Add the weekly free fries offer to your cart, order a large fries
Add a hamburger, add tomato or lettuce onto it to generate a 15-20c upcharge
Go to checkout, click the redeem 175 points for the burger. Your total s/b 20c for the added burger topping and the large fry + tax.
If you don’t want lettuce or tomato, go to ‘extras’ and add a sauce packet for 25c to get the fries free. total will be 25c plus tax