Answer:
£27,750
Explanation:
See the attached spreadsheet.
The top row shows the range and tax rate for the home value. (e.g., From £145,000 to £250,000), the tax rate is 2%).
The second row shows the the total tax for that range if the sales value is over £145,000 but below £250,000.
This is done for each column until the value of the house is covered. The blue box is the value that remains on the house, and it is covered by the 10% tax.
The tax for each segment is shown on the third row, with the sum of the taxes on the far right, in green.
The sum of the taxable segments sums to the value of the house (in yellow), as it should.