Hello, please solve these two problems and show your work. i will give you a thumbs up for your effort. thank you!

A. George secured an adjustable rate mortgage loan to purchase a house 5 years ago,The house value was $200,000. He made a down payment of 20%. The mortgage is to be amortized through semiannual payments for a term of 15 years with an interest rate of 3.2%/y year compounded semiannually on the unpaid balance. (30pts) a. Find the current home equity. (15) b. If his ARM interest rate changes to 4%/year compounded semiannually and his semiannual payments are reset, what will be his new semiannual payment? (15)