Plz answer my grade depends on it

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest