17.3 Edwina bought a chargeable asset in August 2000 for £240,000, paying acquisition costs of £12,000. In June 2003 she sold a one-quarter interest in the asset for £100,000, incurring disposal costs of £5,000. The remaining three-quarter interest in the asset was valued at £500,000 in June 2003. Compute the chargeable gain.

Ignore any "taper relief" that may have been available in tax year 2003-04, prior to the abolition of this relief in 2008-09.

In January 2010, Edwina sold her remaining three-quarter interest in the asset for

£520,000. Compute the chargeable gain.