Metlock Ltd. buys 980 computer game CDs from a distributor who is discontinuing those games. The purchase price for the lot is 7,840. Metlock will group the CDs into three price categories for resale, as indicated below (yen in thousands). Determine the cost per CD for each group, using the relative standalone sales value method. (Do not round ratios for computational purposes. Round final answers to 0 decimal places, e.g. 52,75.)