Diamond Boot Factory normally sells their specialty boots for $26 a pair. An offer to buy 70 boots for $18 per pair was made by an organization hosting a national event in Norfolk. The variable cost per boot is $9 and special stitching will add another $2 per pair to the cost. Determine the differential income or loss per pair of boots from selling to the organization. Enter the amount as a positive number. Differential per pair of boots from accepting the special order is $fill in the blank 2 .