Final answer:
The present value of the amount a professor will earn while on sabbatical is $266,996.60.
Step-by-step explanation:
To calculate the present value of the amount a professor will earn while on sabbatical, we can use the formula for present value of a future sum of money. The formula is:
PV = FV / (1 + r)^n
Where PV is the present value, FV is the future value, r is the interest rate, and n is the number of years.
In this case, the professor earns $70,000 per year and will work for 42 years. The sabbatical salary is paid in one lump sum every 7 years. So, the number of payments is 42 / 7 = 6.
Using the formula, the future value of the sabbatical salary is $70,000 * 6 = $420,000. The interest rate is 6% (EAR), so r = 0.06. And the number of years is 6.
Substituting the values into the formula, we have:
PV = $420,000 / (1 + 0.06)₆ = $266,996.60
Therefore, the present value of the amount the professor will earn while on sabbatical is $266,996.60.