(Compound value solving for r) At what annual rate would the following have to be invested? a. $480 to grow to $1,238.60 in 11 years b. $300 to grow to $450.22 in 6 years c. $52 to grow to $516.55 in 22 years d. $220 to grow to $280.78 in 5 years a. At what annual rate would $480 have to be invested to grow to $1,238.60 in 11 years? % (Round to the nearest whole percent.)