Answer:
28.57℅
Explanation:
If last year attendance was 860 and the attendance increases to 1204:
Attendance increment = 1204-860
= 344
%increase = increment/current attendance × 100%
% increase = 344/1204 × 100
℅ increase = 34400/1204
% increase = 28.57%
Therefore the percentage increase from last year is 28.57℅