C& a makes two types of products using four machines from 9 a. m. to 5 p. m. each day. product a visits machines 1, 2, and 4. product b only visits machines 1 and 3. the capacity is 0.4 unit per minute at machine 1, 0.12 unit per minute at machine 2, 0.2 unit per minute at machine 3, and 0.3 unit per minute at machine 4. the demand per day is 40 units for product a and 160 units for product b. which is the implied utilization for the bottleneck resource?