WP7-Find interest rate based on investment formula

Video by Julie Harland http://yourmathgal/ This is a Word Problem you solve by writing an equation and factoring. Word Problem 7 - Investment problem-At the end of 2 years, P dollars invested at an interest rate r compounded annually increases to an amount, A dollars, given by a formula shown in video. Find the interest rate if $2000 increased to $2420 in 2 years. Write the answer as a percent.<br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos<br />CCSS alignment: HSA-REI.4