Calculate: This function must be called from main() from within the loop.
For each month, calculate the amount of interest to be paid that month (adding this into balance before calculating minimum payment), total of interest paid, amount of minimum payment due for the month, and updating new balance.
If the minimum payment is less than $15.00 then set it at $15.00 if you owe at least $15.00 or the minimum payment will be just what you owe if you owe less than $15.00.
Output: This function must be called from main() from within the loop. There needs to be a separate function to output the table heading. Also output the information input from the file.
There needs to be a separate function to output month, balance at the end of the month, interest paid that month, minimum payment for that month, and the sum of amount of interest paid so far.