The pair of pants at Moore's is $80, and the sales tax is 20%. Calculate the final price.(ill give best revews i need done asap)

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

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

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.