The book value of a company's non-current assets was 200,000 at 1 August 2017. During the year ended 31 July 2018 , the company sold non-current assets for 25,000 on which it made a loss of 5,000. The depreciation charge for the year was 20,000. What was the net book value of non-current assets at 31 July 2018 ? 155,000 180,000 150,000 160,000