Swansong plans to sell 22,000 units of a particular product during July, and expects sales to increase at the rate of 10% per month during the remainder of the year. The June 30 and September 30 ending inventories are anticipated to be 1,700 units and 1,550 units, respectively. On the basis of this information, how many units should Swansong purchase for the quarter ended September 30?

70,970.

71,270.

72,670.

72,970.

Some other amount.