Question on Inheritance Tax

Shola made the following lifetime gifts during the 2015/16 tax year. He has previously made no other lifetime gifts.
(1) 27 September 2015 £30,000 to his daughter
(2) 29 December 2015 £ 475,000 into a trust- Shola paid any inheritance tax

What is the lifetime inheritance tax liability in relation to the lifetime gift on 29th December 2015 ?
A £30,000
B £36,000
C £28,800
D £37,500

Can you explain the answer