A retailer experiences a seasonal demand pattern for its services. Labor requirements over a typical six$-$month period follow.

For Period $1,$ the requirement is $7.$

For period $2,$ the requirement is $8$

For period $3,$ the requirement is $9$

For period $4,$ the requirement is $11$

For period $5,$ the requirement is $12$

For period $6,$ the requirement is $7$

Costs associated with operations are as follows:

Wages $=$ $$2,000$ per worker per month

Hiring cost $=$ $$1,000$ per worker

Layoff cost $=$ $$1,500$ per worker

The current workforce level is $10$ workers. Use the spreadsheet approach and the preceding data to answer the following questions:

a$.$ What is the total cost of a staffing plan, including the cost of regular wages, hiring, and layoffs using a chase strategy with hiring and layoffs, but no overtime? $

$($Round answers to nearest whole number$)$

b$.$ What is the total cost of the staffing plan, using a level strategy in which no overtime is allowed and the undertime paid for? $

$($Round answers to nearest whole number$)$