A machine shop manufactures two types of bolts.  The bolts require time on each of the three groups of machines,  but the time required on each group differs, as shown in the  table below.                       Type I             Type II Machine 1      0.2 min           0.2 min Machine 2      0.6 min           0.2 min Machine 3      0.04 min.        0.08 min Production schedules are made up one day at a time. In a day,  300, 720, and 100 minutes are available, respectively, on these  machines. Type I bolts sell for 15¢ and type II bolts for 20¢. (a)  How many of each type of bolt should be manufactured  per day to maximize revenue? (b)  What is the maximum revenue? (c)  Suppose the selling price of type I bolts began to increase.  Beyond what amount would this price have to increase  before a different number of each type of bolts should be  produced to maximize revenue?

Practical Management Science
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A machine shop manufactures two types of bolts. 
The bolts require time on each of the three groups of machines, 
but the time required on each group differs, as shown in the 
table below.
                      Type I             Type II
Machine 1      0.2 min           0.2 min
Machine 2      0.6 min           0.2 min
Machine 3      0.04 min.        0.08 min


Production schedules are made up one day at a time. In a day, 
300, 720, and 100 minutes are available, respectively, on these 
machines. Type I bolts sell for 15¢ and type II bolts for 20¢.


(a)  How many of each type of bolt should be manufactured 
per day to maximize revenue?
(b)  What is the maximum revenue?
(c)  Suppose the selling price of type I bolts began to increase. 
Beyond what amount would this price have to increase 
before a different number of each type of bolts should be 
produced to maximize revenue?

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