[Feature] EPF calculator

[DyuthiVivek]

Hi @ighoshsubho

We can add a calculator to compute the accumulated amount in EPF fund at retirement.

I am a GSSoC '23 contributor, please assign this issue to me.

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👋 @DyuthiVivek

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Hello @DyuthiVivek, thank you for raising an issue. 🙌 I have assigned the issue to you. You can now start working on it. If you encounter any problems, please feel free to connect with us. 👍