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AJ PHP Software Source Code Financial Library
Percent Interest Rate

number percent_interest_rate ( number, number )


percent_interest_rate returns the interest rate given interest accrued and the original amount.

Percent Interest Rate = interest accrued / original amount X 100%

Source Code:

function percent_interest_rate ($interest_accrued, $original_amount)
  //variable and initializations
  $the_result = 0.0;

  //calculate interest rate
  $the_result = $interest_accrued / $original_amount * 100;

  //return the value
  return $the_result;


include ("ajfinancial.php");

$accrued_amount = 6.00; //6 dollars
$original_amount = 100.00; //100 dollars

$precent_interest_rate = percent_interest_rate($accrued_amount, $original_amount);

echo "accrued amount = $accrued_amount<br>";
echo "original_amount = $original_amount<br>";
echo "precent_interest_rate = $precent_interest_rate<br>";

Run Example

percent interest rate percent interest rate
simple interest simple interest
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present worth SPPWF present worth
sing payment present worth factor

References - Books:
Leland T. Blank and Anthony J. Tarquin.r. 1989. Engineering Economy. McGraw-Hill, Inc.
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