4. My Kek Lapis is a layer cake baking house who produces layer cake for both domestic and exports markets. The demand function for the domestic market is : PD=200-0.05QD QD is the quantity demanded for domestic market, and PD is the price in RM The demand function for the export market is: PE= 125-0.0125QE Where QE is the quantity demanded for the exports market and PE is the price in RM, and Q=QD+QE The cost function for this company is: TC= 25,000+5Q i. If the company practices third-degree price discrimination, calculate the price it should charge for each market. ii. Calculate the profits that the company will earn from the said pricing strategy iii. If the firm is practicing single pricing, determine the price it should charge to customers.