give the answer of these three questions

13. A lorry load of materials of mixed goods was purchased for Rs. 1,00,000. Later on these were sorted out ints the followinn natascion. Find the purchase rate per unit of each category of the material assuming that all the grades yield same rate of profit. 14.After inviting tenders, two quotations are received as under: Supplier-X-Rs.2.20 per unit Supplier-Y-Rs2.10 per unit plus Rs.2,000 fixed charges irrespective of units ordered. Calculate the order quantity for which the purchase per unit will be the same. Considering all factors regarding production requirements and availability of finance. The purchase officer wants to place an order for 15,000 units. Which supplier should be selected? 14. A consignment consisting of four grades of materials was purchased for Rs.2,40,000. The storekeeper sorted them out and recorded the followina. The total sales of grade A amounted to Rs 32,000 , ( the rate of profit being 1/3rd of cost) and those of grade B at a price 1.5 times that of grade A (but the rate of gross profit was 1/3rd of sales). Similarly, the grade C materials sold for Rs. 1,00,000, yielding gross profit 20% on sales. Calculate purchase price per unit of each grade