G1: $110,000

1A: $110,000 ÷ 11 = **$10,000**

1B: $66,000 ÷ 11 = **$6,000**

W2: $40,000 × 20% = **$8,000**

Net amount payable: (1A − 1B) + W2 = ($10,000 − $6,000) + $8,000 = **$12,000**