Final answer:
By calculating the present value of the income for both Career A and Career B using a discount rate of 0.3, it is found that Career A has a slightly higher present value, making it the preferred choice for the student.
Step-by-step explanation:
To determine which career choice a student would prefer given a discount rate of 0.3, we must calculate the present value of the incomes from both careers. The present value is the value of a future amount of money today given a specific interest or discount rate.
For Career A, the present value of the income is:
PV_A = $20,000 + \frac{$40,000}{(1+0.3)} = $20,000 + \frac{$40,000}{1.3} \approx $50,769
For Career B, the present value of the income is:
PV_B = $8,000 + \frac{$55,000}{(1+0.3)} = $8,000 + \frac{$55,000}{1.3} \approx $50,385
Comparing these present values, we see that the present value for Career A is slightly higher. Therefore, choosing Career A would be financially more favorable for the student, assuming the discount rate accurately reflects their personal rate of return.