Could you please explain to me how to get the answer for this question?

1. Like most small companies, Dellvoe has two primary sources of short-term debt: trade credit and bank loans. One supplier, which supplies Dellvoe with $50,000 of materials a year, offers Dellvoe terms of 2/10, net 50.

1. What are Dellvoe's net daily purchases from this supplier?
2. What is the average level of Dellvoe's accounts payable to this supplier if the discount is taken? What is the average level if the discount is not taken? What are the amounts of free credit and costly credit under both discount policies?
3. What is the APR of the costly trade credit? What is its EAR?