Craig earns $60,000 a year working as a maintenance manager at the local hospital Through his employer, he has a disability insurance policy that covers 60% of his salary in case of total disability) with a 1-month waiting period. The policy includes a provision for the payment of residual disability benefits. Eight months ago, Graig had to undergo knee-replacement surgery. He was completely ot work for six months. Craig's doctor then recommended that he go back to work on a part-tone basis for the next two months, during which time he earned a $1,500 a month salary. Craigis now back working full time. How much did Craig receive in disability benefits during his 8-month recovery? 

$18,000. 

$19,200. 

$21,000. 

$22,200.