11. An individual begins processing 3 jobs one after another at time 0 . Each job has a certain processing time xi. Namely, Job 1 has processing time 5 , Job 2 has processing time 7, and Job 3 has processing time 12. If the job i is completed at time t the processor earns the return Ri(t). You are given: R1(t)=120/t,R2(t)=30t;R3(t)=217t. Jobs can be processed in any order, with the objective to maximize the sum of returns. Find the optimal order and the maximal return possible