Please Explain

Realize the table is PERCENTAGES of 200.....you probably found 13%    13% of 200 = 26

Note that second column is in percentage

So....we have 200 riders in total

The relative % of those under 55%  =   [ 2 + 0 + 10 + 24 + 30 +12 + 9 ]   =  87%

So.....100 - 87 =  13%    are older than 55

So.....13% * 200 = .13 * 200 =   26