document.write( "Question 1136750: AT AGE 25, TO SAVE FOR RETIREMENT, YOU DECIDE TO DEPOSIT $75 INTO AN IRA AT THE END OF EACH MONTH AT AN INTEREST RATE OF 6.5% PER YEAR COMPOUNDED DAILY. HOW MUCH WILL YOU HAVE FROM THE IRA WHEN YOU RETIRE AT AGE 65? FIND THE INTEREST. \n" ); document.write( "
Algebra.Com's Answer #754570 by Theo(13342)![]() ![]() You can put this solution on YOUR website! if you meant compounded monthly, it's pretty straight forward with the use of a financial calculator.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "if you meant compounded daily, it becomes more complex, but can still be done.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "first i'll do compounded monthly.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " ![]() \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "next i'll do compounded daily.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " ![]() \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the interest is the future value minus the sum of the payments.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "480 * 70 = total payments of 33,600.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "with monthly compounding, the interest is the future value minus the sum of the payments = 159,853.32 - 33,600 = 126,253.32.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "with daily compounding, the interest is the future value minus the sum of the payments = 160,608.18 - 33,600 = 127,018.18\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "with monthly compounding the annual rate of 6.5% is divided by 12 to get a monthly rate of .541666666666.....\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "with daily compounding, there are probably several methods to calculate it.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "not knowing which method your instructor might have wanted you to use, the method i chose is the following.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "6.5 / 365 = a daily rate percent of .0178082192.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "divide that by 100 to get a daily rate of .000178082192.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "add 1 to it to get 1.000178082192.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that's the daily rate plus 1.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "to convert it to a monthly rate plus 1, do the following:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "1.000178082192 ^ (365 / 12) = 1.005430878.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that's the monthly rate plus 1.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "subtract 1 from that to get .005430878.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that's the monthly rate.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "multiply that by 100 to get .5430878.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that's the monthly rate percent that is input into the calculator.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the rate percents shown in the calculator are the figures i gave you rounded to 6 decimal digits. \n" ); document.write( " |