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Mathematical centripetal formula
It is known that 72% of the passengers have seats, and there are 96 passengers on the lower floor. (a) Find out the total number of passengers in the car. Find out the number of passengers standing on the bus.

72% people sit, 36% people sit in the upper and lower floors, and the total number of people in the lower floors accounts for 1-36%=64%.

Total number of people up and down: 96÷64%= 150 (person)

Number of passengers standing on the lower floor: 150x( 1-72%)=42 (people)