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  3. suppose robotsx1 and staffx2 are needed to run a shop...

Question: suppose robotsx1 and staffx2 are needed to run a shop...

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Suppose robots(x1) and staff(x2) are needed to run a shop. Robots cost $21 p year while staff cost $49 per year. Also, robots can serve 7 customers an hour while staff can serve 4 customers per hour. Suppose the shop needs to serve 74 customers per hour while achieving the lowest cost. What is the total cost of robots and staff needed anually ?

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