Creating the ability to take a loan

As you currently start the game with a pretty small amount of money I wanted to get a grip on the loan part of the banking system fairly quickly. 

To start this I have built a simple loan system with these features:

• There is no maximum amount you can borrow
• You select an amount from a drop down it isn't free text (can be repeated)
• There is a flat 18% interest on any amount
• The payment is always broken into 12 monthly payments
• There is an increasing monthly amount whenever you add to the amount you have borrowed

In the 0.2 version of the loan system I will look to implement a sort of credit checking routine which limits what you can borrow. It is also worth noting that this is only borrowing from the bank.... Loan sharking will come in the future.