A division sold 260000 calculators during 2020:

Sales			$2600000
Variable costs:
Materials		$494000
Order processing		195000
Billing labor		143000
Selling expenses		78000
Total variable costs		910000
Fixed costs			1000000

How much is the unit contribution margin?

Select answer from the options below

$1.00

$3.50

$7.35

$6.50