Answer:
Saved money = 0.41x
Explanation:
x : hours Andrea works
If the 18% is subtracted from her paycheck, she still has the 82% (100 - 18)
Then after that she has:
0.82x
Now Andrea saves 50% of the remaining check (0.82x)
Saved money = 0.5(0.82x)
Saved money = 0.41x