Janus Inc., a toy manufacturer, provided the following information:

Domestic unit sales price: $50

Unit manufacturing costs:

Variable - $10

Fixed - $ 8

The company has received an offer from an exporter for 9,000 units of toys at $60 per unit. The additional business is not expected to affect the normal production or domestic sales of Janus. The company's differential revenue from the acceptance of the offer is ________________.

$450,000

$720,000

$540,000

$225,000