Answer:
No, Loni should not take the loan and build the app.
Step-by-step explanation:
If she borrows $87,000 to build the app, at the end of the year she will have to pay $87,000 x (1+0.15) = 100,050 in principal and interest to the bank.
After selling the app she will get 99,000 - 100,050 = $1,050.
In other words, she will be making a loss.