Christians how do I determine this mortgage rate?

Determine Aaron’s and James monthly interest costs if they decide to make monthly payments. Determine also how much interest Aaron and James would save by paying weekly. Purchase Price ,350,000 Down Payment ,008,000 Interest rate % Amortization Period: 30 years Payment Frequency: monthly Payment and principal interest: 50.?? how do I determine the unknown values [...] http://bit.ly/pASx51