handwritten step by step solution please, engineering economics subject

What is the present equivalent value (S billion) of the following proposed payment schedule: A payment of S6 billion is made one year from now, and another payment of $5 billion two years from now. Twelve additional payments of $4.25 billion each year thereafter will result in a total of $62 billion having been paid. The interest rate is 3% per year. a. 40.99 b. 52.84 c. None of these answers d. 50.41