please show me your work.

Andre Candess manages an office supply store. One product in the store is computer paper. Andre knows that 10,000 boxes will be sold this year at a constant rate throughout the year. There are 250 working days per year and the lead-time is 3 days. The cost of placing an order is $30, while the holding cost is $15 per box per year. If Andre orders 500 boxes each time he orders from his supplier, what would his total annual inventory cost be (holding cost plus ordering cost)?

The answer is $4,350

But i need how it comes please.