Yoko Limited expects to incur the following costs to produce and sell 35 000 units of its product at R14.50 each: Variable manufacturing cost           R105 000 Fixed manufacturing cost               R40 000 Variable marketing expense           R52 500 Fixed marketing and administrative expenses R30 000 Calculate the marginal income per unit  If Yoko Limited decides on a selling price of R16 and has profit objective of R79 500, calculate the target sales volume.