Please answer the following questions below:

1) With V = 100, Pc/Pf = -1/2, Qc = 20 then Qf = ?

HINT: You can use 2 formulas below to solve questions:

V = Pc x Qc + Pf x Qf

Qf = V/Pf (Pc/Pf) x Qc

2) Please explain the reason why you choose the graph

Which graph shows an increase in the price of cloth relative to food P/Pc graph a or graph h? Quantity of food, or Cuantity of foad, Isovalue line Isovalue line Quantity of cloth. QC Quantity of doth, QC Graph a Graph b