On 1 January 2021, Newby acquired 80% of the equity share capital of Oldy. Extracts of their statements of profit or loss for the year ended 30 September 2021 are: Newby Oldy N$'000 N$'000 Revenue 64 600 38 000 Cost of sales (51,200) (26,000) Sales from Newby to Oldy throughout the year ended 30 September 2021 had consistently been N$ 800 000 per month. Newby made a mark- up on cost of 25% on these sales. Oldy had N $1.5 million of these goods in inventory as at 30 September 2021. What would be the cost of sales in Newby's consolidated statement of profit or loss for the year ended 30 September 2021? a. N$ 63.8 million b. N$ 67.9 million c. N$ 59.9 million d. N$ 61.4 million