Revenue transactions impacting trading account and balance sheet

Steps:

• Identify effects on gross profit (sales/COGS in trading account): Transaction 1 adds commission revenue (+$500, no COGS); transaction 2 adds sales (+$2000) and COGS (+$3000).
• Confirm no gross profit impact for others: Transaction 3 is drawings (no P&L effect); transaction 4 is fixed asset disposal (gain in P&L, not trading account).
• Check net assets (assets - liabilities): All increase/decrease equity or assets/liabilities, but focus on those also hitting gross profit.
• Select pair where both affect gross profit and net assets: Transactions 1 and 2 qualify.

Why the correct option is correct:

• Gross profit includes operating revenues like commission and goods sales per trading account rules; both 1 and 2 adjust it and alter net assets via cash/income/COGS entries.

Why the others are wrong:

• B: 1 adds revenue but 4's gain bypasses gross profit.
• C: 2 affects gross profit but 3's drawings skip P&L entirely.
• D: Neither 3 nor 4 impacts gross profit (drawings and disposal gain are non-trading).

Final answer: A