Answer: Annual rate of return = 21.89%
Step-by-step explanation:
Given that,
Expected increase in annual revenues by = $140000
Expected increase in annual expenses by = $88,000 including depreciation
Cost of oil well = $465,000
salvage value at the end of its 10-year useful life = $10,000
Expected Income = Expected increase in annual revenues - Expected increase in annual expenses
= 140000 - 88000
=$52000
Average investment =

= $237500
Annual rate of return =

=

= 21.89%