A brake-shoe costs Rs 75; annual demand is 5000 units, spread evenly over 300 working days. Ordering cost is Rs 800 per order and carrying cost is 20 % of item cost per year. Lead time is 40 working days. Find (a) the economic order quantity (units), (b) the reorder point (units), (c) the number of orders per year (orders/yr) and (d) the total variable (ordering + carrying) cost per year (Rs).