Suppose that the index model for stocks A and B is estimated from excess returns with the following results:

RA $=4\mathrm{.}0\%+0\mathrm{.}50$RM $+$ eA

RB $=-1\mathrm{.}2\%+0\mathrm{.}70$RM $+$ eB

$\backslash$sigma M $=17\%$; R$-$squareA $=0\mathrm{.}26$; R$-$squareB $=0\mathrm{.}18$

What is the covariance between each stock and the market index?