This percentage calculator intends to answer 4 kinds of questions:

**To calculate a% of b**- e.g. 15% of students in the class (20 students total) get grade A, then how many people get "A"?**To calculate the percentage of a in b**- e.g. 3 students in the class(20 students total) get grade A, what is the percentage?**If we know the percentage of a in b, also know a, what is b?****Calculate percentage increase or decrease from a to b**- e.g. a business has revenue of $100,000 on May and $108,750 on June, what is the growth rate?