Answer:
Step-by-step explanation:
[tex]C(m)=0.50m+30\\\\\text{Put}\ C(m)=130\ \text{and solve the equation for }\ m:\\\\130=0.50m+30\qquad\text{subtract 30 from both sides}\\\\130-30=0.50m+30-30\\\\100=0.50m\qquad\text{multiply both sides by 2}\\\\(2)(100)=(2)(0.50m)\\\\200=1m\to m=200[/tex]
