Corporation allocates support department overhead costs to production departments X and Y by means of the reciprocal allocation method. For the month of June 2017, the following information is available: overhead costs for support department A, $20,000; overhead costs for support department B, $10,000. Also, percentages of services provided to departments are shown in the table below. The simultaneous equation to be used in the allocation of support department A's costs is:

Services Supplied To A To B To X To Y

From A 20% 40% 40%

From B 10% 30% 60%

a. A = $20,000 + 0.10B

b. A = $10,000 + 0.20B

c. A = $10,000 + 0.10B

d. A = $20,000 + 0.20B