Within certain limits, a manufacturer of a vehicle knows that for every fifty pounds of added (or lost) weight, the vehicle will lose (or gain) $1.5$ percentage in fuel efficiency.
a) What is the effect of eighty pounds more weight on the fuel efficiency?
b) What is the effect of eighty pounds less weight on the fuel efficiency?
c) What is the effect of $35$ pounds more weight on the fuel efficiency?
d) What change in weight will give a $5 %$ increase in fuel efficiency?
e) What change in weight will give a $6 %$ decrease in fuel efficiency?