please help with this assignment! I am confused on how to calculate these.

Congratulations! You have just signed a contract to purchase your first home. Your purchase price is $300,000 and you plan to put 20% down. Calculate your monthly principal and interest payments for the life of the loan for: - a 15-year mortgage at 2.875% - a 30-year mortgage at 3.25%. Compare and contrast these two options. - What are the Pros and Cons of each? - Would a rising rate environment impact your decision on which to choose? Why? - How about an environment where rates are decreasing? Would there be a better option