Measurement of the lease liability.

Hi Sir, Could you please help me with the following question from BPP. Fino CoQ QTQ case. On 1 april 20x7, Fino Co increased the operation capacity of its plant. On the recommendation of the finance director, Fino Co. entered into an agreement to lease the plant from manufacture. The present value of the future payments is $350,000. The lease requires three annual payments in advance of $ 100,000 each, commencing on 1 April 20x8. The rate of interest implicit in the lease is 10%. The lease does not transfer ownership of the plant to Fino Co. by the end of the lease term and there is no purchase option available. A non-refundable deposit of $ 100,000 is payable on 1 April 20x7. Fino Co incurred initial direct costs of $ 20,000 and received lease incentives from the manufacturer totalling $ 7,000. After four years it will have to dismantle the plant an estimated(discounted) cost of $15,000. What is the amount that should be shown under non-current liabilities at 31/03/20x9 in respect of this plant? Answer from BPP: Right of use asset calculation 478,000 Less Non Ref. deposit (100,000) Lease Liability =378,000 interest Accrued 1/4/x7-31/03/x8 37,800 Lease Liability as at 31.3.x8 415,800 Payment on 1/4/x8 (100,000) Interest Accrued 1/4/x8-31/03/x9 31,580 Lease liability as at 31/03/x9 347,380 Current Liability as at 31/03/x9 100,000 Non current liability as at 31/03/x9 247,380 I have been struggling on this question to understand why they took the right of use asset less Non refundable deposit to arrive to the lease liability of 378,000? On my own workings I just took the present value of the future payments of 350,000 as the lease liability. Could you please help me this question? Thank you so much.