I have to create a while loop that will calculate how much money will be in my bank account 18 years from now. I start off with $2000, the interest is 0.4%, and my contribution to the account each month is $150. I have to use a while loop to do this and have a plot to show its increase over time. This is what I have but can't seem to make it work:

`oldbalance = 2000;contribution = 150;while i <= 216 interest = 0.4/100*oldbalance; newbalance(i) = oldbalance(i) + interest(i) + contribution(i); oldbalance = newbalance(i);endplot(1:1:216,newbalance(i))xlabel('time,(months)');ylabel('amount in the account in dollars');title('Plot of amount in the account as a function of time');`

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