MEDAL To maximize profit, when should the store be open?

Grocery sales
6-7am $40
7-8 80
8-9 120
9-12 400
12-3pm 600
3-4 200
4-5 60
5-6 120
12-1 40

The cost of groceries sold averages 70% of sales. It costs $22/hr to keep the store open.

Question

MEDAL To maximize profit, when should the store be open?

Grocery sales
6-7am   $40
7-8         80
8-9         120
9-12       400
12-3pm  600
3-4         200
4-5         60
5-6         120
12-1       40

The cost of groceries sold averages 70% of sales. It costs $22/hr to keep the store open.

adamaero · Answer

I tried multiplying the $40 by .7
but that is within making a profit...so it should just keep the same hours?