Answer:
100 hours
Explanation:
If Johnny is paid 245.00 as a one time fee for all his jobs then the total money he is paid is 2245.00
We need to separate the hourly fee from the one-time fee so we subtract 245 from 2245. This leaves us with 2000 dollars.
We know that he will be paid 20 dollars per hour so we need to divide 2000 by 20. This leaves us with 100.
Therefore Johnny worked 100 hours