Kid made contributions to a roth ira over the course of 30 working years his contributions average $4000 annually kit was in the 24% tax bracket during his working years the average annual rate of return on the account was 6% upon retirement kit stopped working and making roth ira contributions instead he started living on withdrawals from the retirement account at this point kit dropped into the 15% tax bracket factoring in taxes what is the effective value of kit's roth ira at retirement? assume annual compounding

a= $287,432.74
b= $305,432.74
c= 240,336.88
d= 298,232.74