Redeemable and Covertible debts

Goodday, the following is a Formular got Taught wc has been proven to in no time give the ans for Covertible and Redeemable options in a short-time period UNLIKE the long process of discounting. So will like to knw should it be used in the exams, will full marks be awarded for this simple approach…???

Kd={I(1-t) (<Fv or Cv> – Mv)÷n}÷{(<FvorCv> Mv)÷2}

The numerator is: I(1-t) (Fv-Mv)÷n or I(1-t) (Cv-Mv)÷n
where:
Fv=face/norminal value, Cv=conversion value MV=mkt value
I= int rate, n=number of yrs to redemption or conversion