Is a multiple of a number is a power of the number

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

25 ! i need asap! ! ill mark brainliest!

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?