Answer:
first you will need to add up the two items that Kim is purchasing. 0.85+1.70.
0.85+1.70=2.55
Once you have the total of the costs you will subtract it by the amount of money Kim has. 5.00.
5.00-2.55=2.45.
Kim will get back 2.45 if he pays with 5 dollars.
Hope this helps! :D