The Titanic Shipbuilding Company has a noncancelable contract to build a small

The Titanic Shipbuilding Company has a noncancelable contract to build a small cargo vessel. Construction involves a cash outlay of $250000 at the end of
each of the next two years. At the end of the third year the company will receive payment of $650000. The company can speed up construction by working an
extra shift. In this case there will be a cash outlay of $550000 at the end of the first year followed by a cash payment of $650000 at the end of the
second year. Use the IRR rule to show the (approximate) range of opportunity costs of capital at which the company should work the extra shift.