`compound-interest``RATE``FREQ``TIME``#!optional``PRIN`procedureThe accumulation function, the principle is assumed

`1`. Returns the compound interest for the`RATE`, applied with`FREQ`, over`TIME`.`RATE``number`; interest rate`FREQ``number`; compounding frequency`TIME``number`; time period to cover`PRIN``number`; principle, default`1`

(compound-interest 0.043 4 6 1500) ;=> 1938.84 ;rounded to 2 places