Parker will earn $600 for working a ten-hour shift as the charge nurse.
Parker is a nurse and earns $45 an hour. He also earns an extra $150 when he is the charge nurse.
Since he does not get paid unless he works at least one hour, we can assume that he will work for ten hours as the charge nurse.
Therefore, Parker will earn:
$45/hour x 10 hours = $450 (for working as a nurse)
$150 (extra pay for being the charge nurse)
Total earnings = $450 + $150 = $600
Therefore, Parker will earn $600 for working a ten-hour shift as the charge nurse.