Answer:
Assuming Melinda is a rational person which maximize his returns:
She has a project which yields more than the oppportunity cost of 10%
Assuming is not:
it will place it on the bank, generating 15 interest revenue from the accounting point of view
and lossing 35 dollars from the economic point of view.
Step-by-step explanation:
She could earn 50 dollars in a year (550 - 500)
from the 500 initial invesment
this rate is: 50 / 500 = 10%
That will be the opportunity cost rate for Melinda.
If she takes the money today it will be because there is a potential project which yields more than this.
She will not put it in the bank as it will yield lower than 10%