while loops with compound interest

2015 11 2
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更新时间：2015 11 3
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hello, i am trying to work out a problem that i am having with while loops. i have to determine how much to save each month in order to reach a goal of 100836 in 216 months. the interest rate is 5.5 per year. so far, i have written the following script but the number does not seem believable to me.
%minimum deposit in 18 years
n=18*12;
balance= 2000;
deposit=200;
while balance<100836.46
balance=balance*(1+(5.5/1200))+deposit;
deposit=deposit+50+(20*n);
end
disp(deposit)
disp(balance)
i end up getting an odd number which is 35160. i think that the number should be in the 200's assuming that the initial deposit is 200.

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Astha Sharma
Astha Sharma 2015-11-2
i asked both questions
Walter Roberson
Walter Roberson 2015-11-2
When you ask the same question multiple times, the volunteers end up spending their time finding and merging the multiple questions, instead of spending their time answering questions.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-11-2

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Why are you adding (20*n) each deposit period?

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Astha Sharma
Astha Sharma 2015-11-2
编辑：Walter Roberson 2015-11-3
i have reworked the problem to be:
balance(1)=2000;
deposit(1)=250;
while balance(b1)<=100836
deposit=deposit+10;
for b1=1:216
balance(b1)=(balance(b1-1)*(1+(5.5/1200))+deposit);
end
end
but this is still not giving me the answer i am looking for.
Walter Roberson
Walter Roberson 2015-11-3
initialize
while true
do a calculation
if we succeeded
break;
end
change the variables for the next try
end

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