Here, We know,
Relative Frequency = Magnitude of species / Total Value
Value of A = 72 & Value of B = 54
Then,
Section (1A) = 24/72 = 0.33
Section (1B) = 44/54 = 0.81
Section (2A) =48/72= 0.67
Section (2B) =10/54= 0.19
[ Just fill the boxes with those values, and don't mismatch columns & raws ]
Hope this helps!