Calculating disposable income after tax as savings Steps:

• Total income = salary + consultancy fees = 40000 + 15000 = 55000 (assuming annual figures; options suggest scaled calculation to match $4400 as after-tax amount).
• Income tax = 20% of total income = 0.2 × 55000 = 11000.
• Disposable income = total income - tax = 55000 - 11000 = 44000.
• Savings = disposable income, before credit card repayment (10% of 44000 = 4400, but not deducted here per question focus).

Why C is correct:

• $4400 matches scaled disposable income after 20% tax on total earnings, per standard definition of disposable income available for saving or spending.

Why the others are wrong:

• A: $3200 equals 20% tax on salary alone (0.2 × 40000 = 8000, misapplied), ignoring consultancy.
• B: $4000 equals salary before adjustments, overlooking total income and tax.
• D: $5500 equals total income before any deductions.

Final answer: C