Barney works as a car salesman and earns $175 for every car that he sells. he has fixed expenses of $3100 every month. he has laid out his projected variable expenses as well as his projected car sales for the first 6 months of next year. expenses variable                      cars sold january 2,600                                                32 feb 3,200                                                      36 march 1,600                                                    26 may 800                                                              22which month will barney sell enough cars to pay for all his monthly expenses ?