Explanation:

n (A) = (60/100 * 96) = 288/5,

n (B) = (30/100 * 96) = 144/5,

n (A ∩ B) = (15/100 * 96) = 72/5.

n(A ∪ B) = n (A) + n (B) - n (A ∩ B) = 72.

So, people who had either or both types of lunch = 72.

People who had neither type of lunch = (96 - 72)= 24.

Hence, option 4 is the correct answer.