She made $40 last week because if you divide 80/2 it gives you 40. Because you are still counting the $5 she had spent.
Answer:
10
Step-by-step explanation:
bh/2
b=5
h=4
=5×4/2
=20/2
=10
A vertical line i believe since x is constant
Starting: 46.75
After 55% discount: 21.04
Total: $21.04