Steel mills in three cities produce the following amounts of steel:

Location	Weekly Production (tons)
Bethlehem	210
Birmingham	240
Gary	320
	770

These mills supply steel to four cities, where manufacturing plants have the following demand:

Location	Weekly Demand (tons)
1. Detroit	200
2. St. Louis	110
3. Chicago	190
4. Norfolk	240
	740

Shipping costs per ton of steel are as follows:

To (cost)
From	1	2	3	4
A	$14	$9	$16	$18
B	11	8	7	16
C	16	12	10	22

Because of a truckers strike, shipments are prohibited from Bethlehem to St. Louis. You would like to determine how many tons of steel to transport from each steel mill to each manufacturing plants.

Formulate this problem as a linear programming model and solve it using the computer. What would be the effect on the slacks of the production in Gary of a reduction in production capacity at the Gary mill from 320 tons to 290 tons per week?

		The slack in the Gary mill does not change.
		The slack in the Gary mill decreases by 20 tons.
		The slack in the Gary mill increases by 20 tons.
		The slack in the Gary mill decreases by 30 tons.
		The slack in the Gary mill increases by 30 tons.