X Partnership sold equipment for $30,000 in the current year. The equipment was contributed by Nat, a 50% partner. At the time of contribution the equipment had an adjusted basis of $40,000 and a fair market value of $35,000. As a result of the sale, what loss must be reported on Nat's personal tax return?

a		$2,500
b		$5,000
c		$7,500
d		$10,000