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The Sunland Store is an experienced home appliance dealer. Sunland Store also offers a variety of services together with the home appliances that it sells. Assume that Sunland Store sells dishwashers on a standalone basis. Sunland Store also sells installation services and maintenance services for dishwashers. However, Sunland Store does not offer installation or maintenance services to customers who buy dishwashers from other vendors. Pricing for dishwashers is as follows:

$\backslash$table$[[$Dishwasher only,$$700$