inheritance tax

Hello,

I need your help for the following question.

– C made the following question lifetime gifts , and agreed to pay any inheritance tax that arose as a result of the second gift.
(a) A gift into a discretionary trust on 18 Feb 2017- the gross chargeable transfer was £274,000.
(b) A cash gift of £150,000 into a discretionary trust on 20 May 2018.

How much lifetime tax is paid by C in respect of the gift on 20 May 2018?

1. The answer is £23,250.
2. In the answer, for the transfer of £274,000, the nil rate band was used and thus out of the £325,000, £51,000 was the remainder. And then, 150000-3000(current year 18/19)-3000(previous year 17/18)-51000= £93000. And finally, 93000*25%= £23,250.

3. My issue is that why no AE was deducted from the 274,000?

Thanks.