A hospital needs to determine how many nurses to hire to cover a 24 hour period. The nurses must work 8 consecutive hours but can start work at the start of 6 different shifts. They are paid different wages depending on when they start their shifts. The number of nurses required per 4-hour time period and their wages are shown in the following table. 
What are the key formulas in cells I12 and B12 for this Excel spreadsheet implementation of the following formulation? 
Definitions:
Muscles
Tissues in the body that have the ability to contract, making movement possible, and are essential for bodily functions and posture.
Bones
The rigid organs that form part of the vertebrate skeleton, supporting and protecting various parts of the body and producing red and white blood cells.
Circulatory System
The body's network responsible for the movement of blood and lymph, including the heart, blood vessels, and blood, crucial for supplying nutrients and oxygen to tissues.
Low Birth Weight
A term used when a newborn weighs less than 2,500 grams (5 pounds, 8 ounces) at birth.
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