G1 = $110,000
1A = $110,000 / 11 = $10,000
1B = $66,000 / 11 = $6,000
W2 = $40,000 x 20% = $8,000
Net amount payable = (1A - 1B) + W2 = ($10,000 - $6,000) + $8,000 = $4,000 + $8,000 = $12,000