please do not solve with excel, show equations that been used

Example 4.16: An Interest-Only Versus a Fully Amortized Mortgage Given: P = $200,000, APR = 6.6% or 0.55% per month, and N = 30 years Find: (a) monthly payment; (b) interest payments during the first year of ownership of the home. Option 1: A fully amortized payment option. Option 2: A five-year interest-only option