China Yuchai International Limited | Annual Report 2013 30 The accompanying accounting policies and explanatory notes form an integral part of the financial statements. 31.12.2011 31.12.2012 31.12.2013 31.12.2013 Rmb’000 Rmb’000 Rmb’000 US$’000 Operating activities Profit before tax 1,299,282 913,576 1,162,119 189,886 Adjustments to reconcile profit before tax to net cash flows: Allowance for doubtful debts made/(written back) (net) 2,343 (19,647) (11,775) (1,924) Inventories written down 52,791 23,478 7,061 1,153 Reversal of write down of inventories (65,203) (47,504) (27,665) (4,520) Depreciation of property, plant and equipment and  investment property 301,557 335,337 377,110 61,618 Amortization of prepaid operating leases 27,286 13,148 11,829 1,933 Dividend income from held for trading investment (1,656) (3,245) (1,009) (165) Impairment of property, plant and equipment 252 8,026 9,163 1,497 Write-off of property, plant and equipment 159 —  —  —  Share of net loss of associates and joint ventures 79,632 36,869 79,086 12,922 Exchange (gain)/loss on financing activities (1,599) (19,399) 16,736 2,734 Fair value loss/(gain) on foreign exchange forward contract —  9,467 (12,198) (1,993) Loss on disposal of property, plant and equipment 9,830 24,623 3,427 560 Gain on disposal of prepaid operating leases (10,678) —  (11,437) (1,869) Gain on disposal of investment property (5,908) —  —  —  Loss on disposal of subsidiaries —  9,436 363 59 Loss on disposal of other investments —  498 —  —  Gain on disposal of held for trading investment —  —  (3,484) (569) Gain on disposal of assets classified as held for sale —  —  (7,292) (1,192) Finance costs 156,174 213,019 161,211 26,341 Interest income (53,159) (99,685) (78,939) (12,898) Fair value loss/(gain) on held for trading investment 16,104 (8,237) 2,866 469 Fair value gain on available-for-sale investment (10,983) —  —  —  Total adjustments 1,796,224 1,389,760 1,677,172 274,042 CONSOLIDATED STATEMENT OF CASH FLOWS  (RMB AND US$ AMOUNTS EXPRESSED IN THOUSANDS, EXCEPT PER SHARE DATA) 