$33)$ 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, Craig had to undergo knee$-$replacement surgery. He was completely off work for six months. Craig's doctor then recommended that he go back to work on a part$-$time basis for the next two months, during which time he earned a $$1,500$ a month salary. Craig is 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.$