1. **Problem statement:** Martin sold his factory on 18 February 2024 for 90000. He bought it on 3 March 2008 for 30000 and made extensions costing 10000 in December 2021. Selling expenses were 3000. We need to compute the Capital Gains Tax (CGT) for the 2024 year of assessment. 2. **Formula and important rules:** Capital Gain = Selling Price - (Purchase Price + Cost of Extensions + Selling Expenses) Capital Gains Tax is usually calculated on the net capital gain after deducting allowable costs. 3. **Calculate total cost base:** Purchase Price = 30000 Cost of Extensions = 10000 Selling Expenses = 3000 Total Cost Base = 30000 + 10000 + 3000 = 43000 4. **Calculate capital gain:** Capital Gain = Selling Price - Total Cost Base = 90000 - 43000 = 47000 5. **Conclusion:** The capital gain for the 2024 year of assessment is 47000. Note: To compute the actual CGT payable, you would apply the relevant tax rate to this capital gain, which depends on the tax laws applicable.