The cross-price elasticity for movie tickets and popcorn is 2.5.
Cross price elasticity measures how quantity demanded of good A changes as a result of a change in the price of good B.
Cross price elasticity -= percentage change in the quantity demanded of good A / percentage change in the price of good B
Cross price elasticity = percentage change in the quantity demanded of popcorn / percentage change in the price of movie tickets
10% / 4% = 2.5
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