To find the solution to this you need to create a fraction first.
The numerator of the fraction should be (4) Choc Pudding + Fish. The denominator of the fraction should be (46) the TOTAL amount of guests. - You get 46 by adding all of the different outcomes.
Then you should simplify the fraction 4/46 to 2/23. Then solve the fraction by inputting it into a calculator. Your answer should be 0.1% rounded to the nearest tenth.