Big Bend Corporation is considering a capital investment costing $2.35 million. The investment is expected to increase annual cash receipts by $900,000. It is also expected to increase annual expenses by $520,000, all of which will be paid in cash except for depreciation of $90,000. The proposal's payback period expected to be: O 7 years. O 4 years. O 6 years. O 5 years