Please answer the below and provide steps on the answer. Need in 30 minutes

You are plant supervisor and are responsible for scheduling workers to jobs on hand. After estimating the cost of the assigning each of five available workers in your plant to five projects that must be completed immediately, you solved the problem using the Hungarian method. The following solution is reached and you post the job assignments:

Jones to project A

Smith to project B

Thomas to project C

Gibbs to project D

Heldman project E

The optimal cost was found to be $492.00 for these assignments. The plant general manager inspects your original cost estimates and informs you that increased employee benefits mean that each of the 25 numbers in your cost table is too low by $ 5.00. He suggests that you immediatley rework the problem and post the new assignments.

Is this necessary? Why? What will the new optimal cost be?