Bart earns $100,000 per year as an auto mechanic.  He has a…

Bart earns $100,000 per year as an auto mechanic.  He has a disability policy with a benefit of $5,000 per month; his policy also includes residual benefits.  He suffers a disability to his left hand while working on his Porsche.  As a result of this injury, he has to work a desk job earning $60,000.  How much in disability benefits will he receive?