The Delta Dam Company Has a Capital Structure of 80 $\beta$

The Delta Dam Company has a capital structure of 80% risky debt with a $\beta$ of .9 and 20% equity with a $\beta$ of 1.6. Their current tax rate is 34%. What is the $\beta$ if Delta Dam was an unlevered firm?

A) 1.09
B) 1.04
C) 0.80
D) 0.56
E) 0.44