Acertain company sells and ships bulk dried foods using the following pricing scheme. they charge $3 per pound for the first 10 pounds, $1.50 for the next 10 pounds and $.50 per pound for any remaining amount, up to 40 pounds. shipping charges are $7.50 for packages up to 10 pounds and $12 for packages over 10 pounds. write a piece-wise function showing the cost f(x) to buy and ship x pounds of dried foods from the company described above. then, graph the function