Given that the concentration has been modeled by the formula: C(t)=50t/(t^2+25) where: t is time in hours. The concentration after 5 hours will be given by: t= 5 hours plugging the value in the equation we get: C(5)=(50(5))/(5^2+25) simplifying the above we get: C(5)=250/(50)=5 mg/dl
The manager multiplied the price by 43%, instead of noticing the words "mark up", which means the price increased by 43 percent and the cost is multiplied by 143/100!