Roger has a pension of $$45,000$ p$.$a$.$ and wants to plan for $30$ years of retirement. His RRSP is earning $8\%$ before retirement and he expects it will earn $6\%$ in retirement when inflation is $2\%.$ a What is the present value at retirement of this pension if it is: $1)$ Indexed ii$.$ Not indexed. b$.$ If Roger is also collecting maximum OAS and full CPP retirement benefit as well as withdrawing $$20,000$ a year from his RRSP$,$ what is the value of his OAS benefit after the clawback?