According to a study conducted in $2017$ concerning the

participation, by age, of $401(K)$ investors, the following data

were obtained:

$($A$)$ What percent of $401(K)$ investors are in their $20$ s or $60$ s$?$

$\%$

$($B$)$ What percent of $401(K)$ investors are under the age of

$50?$

$\%$