Answer:
The journal entries are as follows:
(i) On December 31, 2017
Unrealized gain or loss income A/c Dr. $10,800
To estimated purchase commitment liability $10,800
(To record other income and expenses)
Workings:
Unrealized gain or loss income = 36,000 × ($3 - $2.7)
= 36,000 × $0.3
= $10,800
(ii) On January 1, 2018
Raw material A/c (36,000 × $2.7) Dr. $97,200
Estimated purchase commitment liability A/c Dr. $10,800
To accounts payable $108,000
(To record the materials received in January 2018)