(Compound value solving for r ) At what annual rate would the following have to be invested? a. $500 to grow to $1,290.21 in 11 years b. $280 to grow to $511.85 in 7 years c. $47 to grow to $668.89 in 19 years d. $204 to grow to $273.00 in 5 years a. At what annual rate would $500 have to be invested to grow to $1,290.21 in 11 years? \% (Round to the nearest whole percent.) b. At what annual rate would $280 have to be to invested to grow to $511.84 in 7 years? % (Round to the nearest whole percent.) c. At what annual rate would $47 have to be invested to grow to $668.89 in 19 years? % (Round to the nearest whole percent.) d. At what annual rate would $204 have to be invested to grow to $273.00 in 5 years? \% (Round to the nearest whole percent.)