On 1 September, 2015, Perfect Account Sdn Bhd cut a new deal for compact disks (CDs) on tutorial materials entitled 'Accounting for Dummies' with Video Enterprise. Royalty payable is RM10 for every CD sold. A total of 500,000 units have been produced but only 200,000 units have been sold as at 31 December, 2015. How much royalty income can be recognized as revenue by Perfect Account Sdn Bhd on 31 December, 2015