date,cost,output,defective
14-01-01,400,80,9
14-02-01,350,60,6.5
14-03-01,450,70,7.5
14-04-01,550,65,8
14-05-01,500,75,5
14-06-01,650,90,2
14-07-01,800,85,4.5
14-08-01,700,75,7
14-09-01,450,70,5
14-10-01,500,65,3.5
14-11-01,400,60,8
14-12-01,500,80,5