At the end of 2011, the value of my savings account was $15,000. Over the next four years, the account earned the rates of return shown below. How much was in the account at the end of the fourth year, 2015?
Rate of return in 2012: 7%
Rate of return in 2013: -6%
Rate of return in 2014: 9%
Rate of return in 2015: 12%