A. 8 1/3%
Feedback Loss = (CP of 33 m) - (SP of 33 m)
(SP of 3 m) = (CP of 33 m) - (SP of 33 m)
(SP of 33 m) + (SP of 3 m) = (CP of 33 m)
(SP of 36 m) = (CP of 33 m).
Let the CP of 1 m be $ x.
Then, CP of 36 m = $ 36x
SP of 36m = (CP of 33m) = $ 33x.
Thus, CP = $ 36x and SP = $ 33x.
Since (CP) > (SP), there is a loss.
Loss = $ (36x - 33x) = $ 3x.
Loss% = [(loss/CP) × 100]%
= [(3x/36x) × 100] % = 25/3% = 8 1/3%