* Added apr_interest function to financial
* Update interest.py
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Update financial/interest.py
* float
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Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* Financial: principle -> principal
The originally invested amount of money: `principal`
-- https://www.grammarly.com/blog/principle-principal/
* updating DIRECTORY.md
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