The number of people who bought popcorn and also added butter is 306.
Number of people who went to theater = 425
Fraction of people who bought popcorn = 4/5
Fraction that added butter = 90% = 9/10
Based on the information given, the number of people who bought popcorn also added butter will be:
= 425 × 4/5 × 9/10
= 425 × 0.8 × 0.9
= 306
Therefore, the number of people who bought popcorn and lso added butter is 306.
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