Question $4(10\%)$:

Mrs$.$ Adams bakes cakes at home for events on a contractual basis. With just one oven, she faces a busy

Saturday morning when she has committed to finishing six orders. Her husband will handle deliveries, which

takes $15$ minutes each. Assuming she starts baking at $7$:$00$ A$.$M$.,$ she's in for a hectic day with as shown in

the following table:

Page $12$ of $12$

Event Time required $($min$)$ Delivery Time

$17210$:$30$ AM

$2409$:$00$ AM

$313210$:$00$ AM

$43012$:$00$ PM

$518611$:$00$ AM

$6251$:$00$ PM

a$.$ Determine the processing sequence using each of these priority rules: First Come First Served, Shortest

Processing Time, Earliest Due Date and Critical Ratio.

b$.$ Determine the performance of each rule using average flow time, average WIP and average days late.

Which rule is the best? Explain.