Answer:

Step-by-step explanation:-
As per the statement:
Quinton bought x number of shares for p dollars and paid a 0.5% commission
⇒
It is also given that: He sold the stock for y dollars and paid a flat fee of $7.
⇒
then;
Net proceeds is given as:

Therefore, Quinton's net proceeds algebraically is 
8.9% is equal to 0.089 because a percent is over a 100. So, you can just multiply the ROI by the investment to get:

Your answer is:
$712.
18 x
--- = ----
5 100
18×100 = 5×x
1800 = 5x
------- ----
5 5
360 = x
Hope this helps!!!
Step-by-step explanation:

We have to simplify the given expression.

We know that:


Therefore, we get:



