Part A) Find the interest rate of return for the following cashflow. (Choose the positive solution)

t = o ____ A₀ = 110 ____ B₀ = 100

t = 1 ____ A₁ = 50 ____ B₁ = 0

t = 2 ____ A₂ = 100 ____ B₂ = 110

Part B) Find the net present value of the same cashflow above if the interest rate per period is 10%

Please have answer step by step form with clear notes. Thank you!