Answer:
For company A:
100 + (20h)
OR
100 + (20 x h)
For company B:
40h
OR
40 x h
Explanation:
For company A, you are multiplying 20 by h because you must pay $20 per hour. Then, you have to add 100 to that because there is a $100 dollar rental fee.
For company B, you are multiplying 40 by h because you must pay $40 per hour. There is no rental fee, so that means you don't have to add anything.
Hope this helps!