as you can see in the row ages 51-75, total is 34, merengue dancers x% will be
x=34-(10+5+7)=12
then total in first column is 22%
then samba column total will be
100(22 + 32 + 17)=29%
now you can find percentage of the members are ages 31-50 and most recently danced the samba, it will be 29-(5+11)=13
same way you can fill out the table and it will be
.......ages......| merengue | bachata | samba | pasillo I total
______________________________________________________________
18-30..........|.... 3% | .... 18% |…. 11 % | .... 9 %
|... 41%
31-50 " … 7 % | • - 4 % | ...... 13 % | ..... 1
% |.......25 %
51 - 75 .......... | 12 % |.... 10 % |….. 5% | ...... 7 %
|... 34 %
total ........| .. 22% |.... 32 % |.... 29 % |.... 17%
|.... 100 %
so, answer is: 13 % of the members are ages 31 to 50 and most recently danced the samba