Final answer:
A minimum wage employee earning $1.25 per hour in California on September 7th, 1963, would need to work 6 hours to earn $7.50.
Step-by-step explanation:
On August 30th, 1963, the minimum wage in California increased to $1.25 per hour. To calculate how many hours a minimum wage employee would need to work to earn $7.50 at this rate on September 7th, 1963, you would divide the total amount earned by the hourly wage: $7.50 ÷ $1.25 = 6 hours. Therefore, a minimum wage employee would need to work 6 hours to earn $7.50.