Start:
A = Rs 0
B = Rs 0
C = Rs 0
A owe Rs 1000, Rs 500 to B and C:
A = Debt = Rs 1000
B = Owed = Rs 500
C = Owed = Rs 500
(Assumes A) Spend Rs 300, returns Rs 100 to A,B (Assumes typo, so B,C):
A = Debt = Rs 1000 + Rs 300 + Rs 100 + Rs 100 = Rs 1500
B = Owed = Rs 500 - Rs 100 = Rs 400
C = Owed = Rs 500 - Rs 100 = Rs 400
Balance Rs 900,Rs 400 to B and C:
A's Balance = Rs 900
NOTE: We were never told A's balance to begin with.
We can compute it to start at 900 + 300 + 100 + 100 = Rs 1400.
B = Owed = Rs 400
C = Owed = Rs 400
(Assumes A's) Total Debt:
A's Debt = Rs 1500
A's Balance = Rs 900
A's Net Worth = - Rs 600