Sneaky difference in how preferred equity is treated in finding BV?

In the market based valuation chapter, EOCQ 17 and 22 both need to find BV of equity, 17 removes the BV of preferred equity, while Q 22 removes the MV. (80 vs 84).

Does anyone know why this is?

Would you perhaps be able to post some screenshots?
I tried looking at those questions in my book, and my questions are probably different than yours (I am a November candidate so the 2023 book probably puts the EOCQs in a different order than the 2024 book).

Iā€™m so sorry- it is 19 and 22
Balance sheet info:


Q 19
image
Answer to 19
image
Q22
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Answer 22

In 22 they deduct 84 while in the answer to 19 they deduct 80? Its also not clear to me where the 84 comes from

CFAI has posted Errata for this question:

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Thank you!