# Homework Help: Is it correct or not

1. Mar 5, 2010

### r-soy

Hi all

I try to solve and i want checkmy answer

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2. Mar 5, 2010

### Staff: Mentor

People will be more likely to help you out if you post the question and your work right in the text entry window. It's very difficult to have to open one window to see the problem, and then open another to see your work, but not be able to see the problem.

3. Mar 5, 2010

### Coto

For #13 you state 79.23. Well, 79.23 months? days? years? seconds? Doing the calculation myself tells me that you've done something wrong here.

For #14 you say 43 years?? If he saves 32Rs/year for 43 years he would save well over 200Rs and that's not accounting for the +4 Rs/year.

4. Mar 5, 2010

### r-soy

Help me what wil i do ?

5. Mar 5, 2010

### Coto

Setup some simple formula describing what they are doing.

For example, if you want to find the number of years it takes to save 200Rs given all the information in the problem, you could setup something like:

$$32 + (32 + 4) + (32 + 4 + 4) + ... + (32 + 4N) = \sum_{n=0}^N (32 + 4n) = 200$$

and solve for N.