‏A local toy manufacturer is using a production line that runs 8 hours per day and produces a toy that requires a total of 7 tasks to be performed . The daily demand is 200 toys . Times of the tasks are 2.73 , 2.01 , 2.13 , 2.0 , 2.61 , 2.71 , and 2.95 minutes for A , B , C , D , E , F , and G , respectively . However , due to the nature of the product there are precedence rules that must be observed . Such that Task A does not need any predecessors ; task B requires task A to be completed . To start task C and task D , each require task B to be completed . Task C must be completed prior to stating task E. Task F needs both task D and task E to be completed . Finally , task G can start only once task Fis completed. What is the minimum number of ? workstations needed 4 .a 8 .bo .CO None of them do 5 .eo

Richardson hired j. c. flood company, a plumbing contractor, to correct a stoppage in the sewer line of her house. the plumbing company's 'snake' device, used to clear the line leading to the main sewer, became caught in the underground line. to release it, the company excavated a portion of the sewer line in richardson's backyard. in the process, the company discovered numerous leaks in a rusty, defective water pipe that ran parallel with the sewer line. to meet public regulations, the water pipe, of a type no longer approved for such service, had to be replaced either then or later, when the yard would have to be excavated again. the plumbing company proceeded to repair the water pipe. though richardson inspected the company's work daily and did not express any objection to the extra work involved in replacing the water pipe, she refused to pay any part of the total bill after the company completed the entire operation. j. c. flood company then sued richardson for the costs of labor and material it had furnished. (c) for what, if anything, should richardson be liable? explain."