needing a step by step solution for each question on 4 please and thank you! :)

4. Consider these facts: David and Karen want to buy a house for $250,000 and they have 20% to pay down plus all required closing costs and foes. They apply for a loan from Mid-First Bank in the amount of $200,000. The loan is approved for 30 years at 3.75%. a. What is the loan payment amount? b. If Mid-First Bank sells the loan to Wells Fargo on the same day the loan is originated at a yield to Wells Fargo of 3.30%, what will Wells-Fargo have to pay Mid-First Bank for the loan? c. What is Mid-First Bank's gross profit on this sale transaction to Wells Fargo