How to solve this? can you me i no sure

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

Write an algebraic expression for the word expression the quotient of c and 8