Month Marketing Cost ( $ ) Sales (Number of cars ) January 68 000 365 Feburary 39 500 398 March 25 500 101 April 45 600 205 May 76 200 453 June 80 200 487 July 50 100 217 Aug 42 600 286 September 54 600 241 October 78 500 465 November 63 200 317 December 64 200 339