Question 380958
he bought 70 for 9730 at a cost of 9730/70 = 139 apiece.


he had 13 left at a cost of 1807.


cost of goods sold is 9730 - 1807 = 7923


number of goods sold is 70 - 13 = 57


57 * 139 = 7923


number confirm each other.


7923 is your answer.