ANSWER:

Equivalent Salary in California=Salary in Oklahoma×RPP in OklahomaRPP in California​

Given:

• Salary in Oklahoma = $60,000
• RPP in Oklahoma = 91.3
• RPP in California = 111.2

Substitute these values into the formula:

$$\text{Equivalent Salary in California} = 60,000 \times \frac{111.2}{91.3}$$

Calculate the ratio:

$$\frac{111.2}{91.3} \approx 1.217$$

Then:

$$\text{Equivalent Salary in California} = 60,000 \times 1.217 \approx 73,078$$

Final Answer:

You would need to earn approximately $73,078 in California to have the same standard of living as a $60,000 salary in Oklahoma. Thus, the correct answer is d. $73,078.