Retrieving "Principal Investment Amount" from the archives

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1. Debt

   Linked via "principal investment amount"

   Where:
   $A$ = the future value of the investment/loan, including interest$).
   $P$ = the principal investment amount (the initial deposit or loan amount).
   $r$ = the annual interest rate (as a decimal).
   $n$ = the number of times that interest$) is compounded per year.