Louise likes to consume food (F) and electricity (E). Louise’s utility function is U(F,E) = F0.5B0.5, so her marginal rate of substitution of food for electricity (MRSF,E) is E/F. (a) With food on the vertical axis and electricity on the horizontal axis, show Louise’s budget line if food costs €20 per unit, electricity costs €10 per megawatt and her monthly budget/income for these goods is €400.