Bonnie works as an instructor at the local college. She has a gross salary of $5,200 per month. Bonnie's average tax rate is 25%. The college provides and pays for the premiums on a group disability policy that provides benefits for 60% of her gross income. If Bonnie were to become disabled and unable to work, what is the net monthly benefit she would be entitled to?

a)$1,300

b)$2,340

c)$3,120

d)$3,900