On a school trip to the space museum, 30 students visited the astronaut exhibit. Tickets for admission cost $18. Which expression can be used to mentally compute the total cost of admission tickets?
A. 30 (10 + 8) C. 15 (2 + 8)
B. 15 · 2 + 10 · 8 D. 30 (10 - 8)
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