C++ :: Mortgage Calculator - Displaying Months In Correct Order

I need my code to display Month but it seems my code is skipping month's and not displaying 1, 2 3. It's going 1 , 3 ,5 and so on. This is the code i have for it

Code:
int month = 1;

And later on the code i have month++ That's my first mistake and i'm not sure how to possibly fix it. My second mistake is my Interest Paid output. This is the code i have for it

Code:
interestPaid = loanBalance*i;

This is on the while loop, but i'm not sure why it's not displaying the correct amount. It should display for month 1 = 500.00 , Month 2 = 498.28 and Month 3 = 496.55 and so on... However my code display's something close to it, but not that. i is my monthly interest rate. My code for it seems to be fine. If i can fix this two things i'll be able to finish the project. This is my entire code, how i can fix it so that my month is displayed in 1, 2, 3, etc.... and not 1, 3, 5, etc... And why my interest is not displaying what my professor has on his output screen (i provided the first three months on top in bold) If i can fix those things i'll have the rest. Here's my entire code

#include <iostream>
#include <iomanip>
using namespace std;
int main ( ) {
int month = 1;
// Holds the user's amount of loan.
double loanAmount;
// Holds the user's interest rate.
double i;

[Code] ....