1. A power plant uses coal to generate electricity. Coal is supplied (delivered) at a rate of 9,000 tons per day at price of $16.50 per ton and is used at rate of 1400 tons per day. The plant operates 365 days per year and its annual carrying cost is 28% of acquisition cost. Ordering cost is $675 per order. a) What quantity of coal should they order each time? b) What is the maximum inventory level during the year? Please solve using EPQ formula.