Assume that the market is in equilibrium and that stock betas can be estimated with historical data. The returns on the market, the returns on United Fund (UF), the risk-free rate, and the required return on the United Fund are shown below. Based on this information, what is the required return on the market, $r_M$?
Year Market UF
2011 -9% -14%
2012 11% 16%
2013 15% 22%
2014 5% 7%
2015 -1% -2%
$r_{RF}$: 7.00%; $r_{United}$: 10.00%;