Twenty years ago, you began investing $250 a month. because your investments earned an average of 8 percent a year, your investment portfolio has a current dollar value of $145,000. how much did you earn on your investments over the 20-year period of time?

You invest $250/mo. over 12 months that equals $3,000 invested per year.

$250*12=$3,000/per year invested

$3,000 per year for 20 years equals $60,000 invested.

$3,000*20=$60,000 invested

8% of $60,000 is $4,800/per year.

0.08*$60,000=$4,800

$4,800 per year for 20 years equals $96,000 dollars earned on investments over 20 years.