The advertised cost of admission to a water park is a nearby city is $25 per student. A student paid $30 for admission and received $3.75 in change. What is the sales tax rate in that city?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.