Answer:
The cost of the tip is $2.63
Explanation:
First, we need to find the sales tax and 5% of 12.5 = 0.625
After that we need to add the tax to the original price which is 0.625 + 12.50 = $13.125
From that price we need to find 20% of it which is 0.20 x 13.125 = 2.625
Now we need to round that to the nearest cent which is 2.63
So, he paid $2.63 in tips.
Hope this helps :)