Please explain to me the answers and make sure that the first answer is $4\mathrm{.}20$ days. I know that is right but not why it is right. Please explain the homework to me$.$ Every step. a$)$ Using the FCFS $($first come, first served $)$ decision rule for sequencing the jobs, the order is $($assume that jobs came in the order in which they are listed in the table$)$:$275.$ Assume each job starts at the beginning of the day and finishes at the end of the day $($a job that begins on day $275$ and takes $8$ days will finish on day $282,$ and the next job begins in the morning of day $283).$ Compute all times based on initiating work on day $275.$a$)$ Using the FCFS $($first come, first served$)$ decision rule for sequencing the jobs, the order is $($assume that jobs came in the order in which they are listed in thetable$)$:A$0).$ The average tardiness $($job lateness$)$ for the sequence developed using the FCFS rule $=\_\_\_\_\_$days $($round your response to two decimal places$).$A$1.$ The average completion time for the sequence developed using the FCFS rule $=\_\_\_\_\_$days $($round your response to two decimal places$).$A$2.$ The percentage utilization for the sequence developed using the FCFS rule $=\_\_\_\_\%($enter your response as a percentage rounded to two decimal places$).$B$.$ Using the SPT $($shortest processing time$)$ decision rule for sequencing the jobs, the order is $($to resolve a tie, use the order in which the jobs were received$)$:B$1.$ The average tardiness $($job lateness$)$ for the sequence developed using the SPT rule $=\_\_\_$ days $($round your response to two decimal places$).$B$2.$ The average completion time for the sequence developed using the SPT rule $=\_\_\_\_$ days $($round your response to two decimal places$).$B$3.$ The percentage utilization for the sequence developed using the SPT rule $=\_\_\_\_\%($enter your response as a percentage rounded to two decimal places$).$c$)$ Using the LPT $($longest processing time$)$ decision rule for sequencing the jobs, the order is $($to resolve a tie, use the order in which the jobs were received$)$:C$1.$ The average tardiness $($job lateness$)$ for the sequence developed using the LPT rule $=\_\_\_\_$ days $($round your response to two decimal places$).$C$2.$ The average completion time for the sequence developed using the LPT rule $=\_\_\_$ days $($round your response to two decimal places$).$C$3.$ The percentage utilization for the sequence developed using the LPT rule $=\_\_\_\_\%($enter your response as a percentage rounded to two decimal places$).$D$.$ Using the EDD $($earliest due date$)$ decision rule for sequencing the jobs, the order is $($to resolve a tie, use the order in which the jobs were received$)$:D$1.$ The average tardiness $($job lateness$)$ for the sequence developed using the EDD rule $=\_\_\_\_$ days $($round your response to two decimal places$).$D$2.$ The average completion time for the sequence developed using the EDD rule $=\_\_\_\_$ days $($round your response to two decimal places$).$D$3.$ The percentage utilization for the sequence developed using the EDD rule $=\_\_\_\_($enter your response as a percentage rounded to two decimal places$).$ e$)$ Using the Critical Ratio $($CR$)$ scheduling rule for sequencing the jobs, the orderis:E$1.$ The average tardiness $($job lateness$)$ for the sequence developed using the CR rule $=\_\_\_$ days $($round your response to two decimal places$).$E$2.$ The average completion time for the sequence developed using the CR rule $=\_\_\_\_$ days $($round your response to two decimal places$).$E$3.$ The percentage utilization for the sequence developed using the CR rule $=\_\_\_\_\%($enter your response as a percentage rounded to two decimal places$).$