In our widget example, we will assume that the fixed cost for the stapler, pen, and âfactoryâ is $10 and the cost of each worker hired is $5 per worker. Since fixed costs are constant, the firm incurs $10 regardless of the level of output. Labor is the only variable cost computed by $5 times the number of workers.
How Bull Sharks Can Live in Both Ocean and Fresh Water. Although there are a handful of species that live in freshwater, we tend to think of sharks as being ocean dwellers. But there is also a very unique shark that can live in both ocean and fresh water estuaries and lakes: the Bull Shark.
Normally sharks swim at a speed of less than 5 kph but few species such as mako sharks are able to cruise at a speed of 48 kph. Makos are the worldâs fastest swimmers. They are agile hunters; built for the speed and chasing prey.Their body is thickest at the center and narrow at the ends.t reaches a length of 40 ft (12 m) and weighs up to 13 tons (12 metric tons). Great white sharks are one of the fast movers in water. They are able to reach speeds of 25 miles per hour (40 km/h). They swim just below the waterâs surface.