Answer:
If her stock was valued at $43.50 per share. Her ROI is:50.89%
Step-by-step explanation:
First step
Purchase price=(28×$30)-(28×$43.50)
Purchase price= $840-$1218
Purchase price=$378
Gain in value=$378+ $49.50
Gain in value=$427.5
Second step
ROI=$427.5/$840×100
ROI=50.89%
Therefore the ROI is $15.89%.