Hi
Could someone assist on how the 65% equity weight is calculated?
Thank you
7.11 = [6 - 6we] * 0.6 + 9we
7.11 = 3.6 - 3.6we +9we
3.51 = 5.4we
3.51/5.4 = we
0.65 = we
Good ol’ aljibber!!! 
This is a classic example of working in reverse to answer a questions.
If the capital structure in either debt or common equity (assume no prefs)
So weight of debt - weight of equity = 1
Weight of debt = 1 - weight of equity
Pick the middle calue of teh 2 solutions
We = 65% therefore Wd = 35%
Calclate WACC on this basis.
Answer correct so ok.
But if calculated WACC was too low need to increase weight of equity (as cost of equity is higher than cost of debt) and so could have adjusted answert.
i think this is quicker than doing algebra that suggested solution method.
Yes, the patented PICK B from our friend @S2000magician works like a charm here!!
Lemme offer another solution: at its core, this is just a linear interpolation problem.
2nd DATA
X01 0 Y01 9 X02 1 Y02 3.6
2nd Quit
2nd STAT
LIN
scroll down to Y’ 7.11 ENTER CPT X’ 0.35. 