4. Some quick calculations (hopefully) showing the relationship between labour productivity, input costs, and marginal costs. Each cake requires labour, ingredients and the use of a kitchen. The kitchen you rented for $3,000 per month can handle any level of output. The numbers might be a bit more realistic if you assume that units of labour are in minutes. (a) (h) (C) (d) The price of labour is $0.25 per unit. At your current level of production, the marginal product of labour is 21\". What is the marginal cost for the next cal-(e if each cake requires $2 in materials? If each requires $3 in materials? The price of labour is $0.25 per unit. At your current level of production, the marginal product of labour is %. Is this an increase or a decrease in labour productivity from the previous question? \"What is the marginal cost for the next cake if each cake requires $2 in materials? If each requires $3 in materials? The price of labour is $0.30 per unit. At your current level of production, the marginal product of labour is 21\". What is the marginal cost for the next cal-re if each cake requires $2 in materials? If each requires $3 in materials? The price of labour is $0.30 per unit. At your current level of production, the marginal product of labour is 215. What is the marginal cost for the next cal-re if each cake requires $2 in materials? If each requires $3 in materials