How much would it cost NASA to put an additional 100 pounds of cargo aboard the space shuttle?

I'm sure the cost of lifting every pound into temporary orbit has been calculated. Any ideas? What is total weight at launch...cargo, astronauts, fuel, boosters...all of it? What's the price tag? How much to take an extra 100 pounds? Thanks.How much would it cost NASA to put an additional 100 pounds of cargo aboard the space shuttle?
GAS or GetAway Special Program rates:


';The cost of this unique service depends on the size and weight of the experiment. Getaway specials of 200 pounds and 5 cubic feet cost $10,000; 100 pounds and 2.5 cubic feet, $5,000; and 60 pounds and 2.5 cubic feet, $3,000. The weight of the GAS container, experiment mounting plate and its attachment screws, and all hardware regularly supplied by NASA is not charged to the experimenter's weight allowance.';


These are 1976 prices. YMMV.How much would it cost NASA to put an additional 100 pounds of cargo aboard the space shuttle?
More than your allowance.