Jeffrey acquired a freehold property in October 2009 for £234,000. In July 2017 he granted Jill a lease on the property for £160,000. The market value of the freehold after the lease had been granted was £200,000. The property was never Jeffrey's residence. Compute the chargeable gain, given that the lease granted to Jill was of duration:

(a) 99 years

(b) 40 years.