Answer: Option (C) is correct.
Explanation:
Given that,
Partner S:
Salary allowance = $20,000
Interest on average capital balance = 10% of 60,000
                                                             = $6,000
Average capital balances for the current year = $60,000
Remainder = 30% of 50,000
                    = $15,000
Amount should be allocated = Salary allowance + Interest on average capital balance + Remainder
                                                 = $20,000 + $6,000 + $15,000
                                                 = $41,000
Partner R:
Salary allowance = $25,000
Interest on average capital balance = 10% of 50,000
                                                             = $5,000
Average capital balances for the current year = $50,000
Remainder = 30% of 50,000
                   = $15,000
Amount should be allocated = Salary allowance + Interest on average capital balance + Remainder
                                                 = $25,000 + $5,000 + $15,000
                                                 = $45,000
Partner T:
Salary allowance = $15,000
Interest on average capital balance = 10% of 40,000
                                                             = $4,000
Average capital balances for the current year = $40,000
Current year net income = $125,000
Remainder = 40% of 50,000
                   = $20,000
Amount should be allocated = Salary allowance + Interest on average capital balance + Remainder
                                                 = $15,000 + $4,000 + $20,000
                                                 = $39,000
Workings:
Salary allowed = $20,000 + $25,000 + $15,000
                          = $60,000
Interest on average capital balance = $6,000 + $5,000 + $4,000
                                                             = $15,000
Total = Salary allowed  + Interest on average capital balance
         = $60,000 + $15,000
         = $75,000
Remainder = Current year net income - Total 
                   = $125,000 - $75,000
                   = $50,000