* Added an algorithm to calculate the present value of cash flows
* added doctest and reference
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* Resolving deprecation issues with typing module
* Fixing argument type checks and adding doctest case
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* Fixing failing doctest case by requiring less precision due to floating point inprecision
* Updating return type
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* Added test cases for more coverage
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* Make improvements based on Rohan's suggestions
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* Update financial/present_value.py
Committed first suggestion
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* Update financial/present_value.py
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* Update financial/present_value.py
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* Calculate GST Amount
The program helps to get the net amount after GST is added to it.
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* Update financial/calculating GST.py
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* Update and rename calculating GST.py to price_plus_tax.py
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* Financial: principle -> principal
The originally invested amount of money: `principal`
-- https://www.grammarly.com/blog/principle-principal/
* updating DIRECTORY.md
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