cumprinc - Functions Centered Around Microsoft Excel Cumprinc Function
Provides similar functionality to 'Microsoft Excel'
'CUMPRINC' function
<https://support.microsoft.com/en-us/office/cumprinc-function-94a4516d-bd65-41a1-bc16-053a6af4c04d>.
Returns principal remaining at a given month, principal paid in
a month, and accumulated principal paid at a given month based
on original loan amount, monthly interest rate, and term of
loan.
