The fixed and variable costs for three potential manufacturing plant sites for a rattan chair weaver are shown:
    
| Site | 
Fixed Cost Per year | 
Variable Cost per unit | 
| 1 | 
$500 | 
$11 | 
| 2 | 
1000 | 
7 | 
| 3 | 
1700 | 
4 | 
a) Over what range of production is each location optimal?
b) For a production of 200 units, which site is best?