The following revenue figures were taken from Rosemont Corporation's adjusted trial balance at the end of the following months (adjusting entries are performed monthly whereas closing entries are performed annually, on December 31): March 31 (end of the first quarter) $ 140,000 September 30 (end of the third quarter) 450,000 December 31 (end of the fourth quarter) 680,000 -------------------------------------------------------------------------------- Compute how much revenue the company earned from (Omit the "$" sign in your response): a. April 1 through September 30 $ b. October 1 through December 31 (the fourth quarter) $ c. April 1 through December 31 $