Let the principal be p (USD) and let annual interest rate be a %.

Put the total amount (balance) after n years,

  

Sn: under the system of simple interest Yn under the system of yearly compound interest hn under the system of half-yearly (semi-annual) compound interest In: under the system of quarter-yearly (quarter annual) compound interest mn:under the system of monthly compound interest Cn: under the system of continuous compound interest.