C. Rs.4000/-
Feedback A's Share = Rs.8000/- per first 6 maonth + Next 6 months Rs.4000/- added
= 80 × 6 + 120 × 6 = 480 + 720 = 1200
B's Share = Rs.4000/- per first 6 months + Next 6 months Rs.2000/- reduced
= 40 × 6 + 20 × 6 = 240 + 120 = 360
Then,A's part= Rs.1200 : B's part= 360
A : B = 10 : 3
Total = 13 parts -----> Rs.5200/-
= 1 part ------> Rs.400/-
Then, A's share is
= 10 parts = 400/- × 10 parts = Rs.4000/-