百分比计算器

解决四种百分比问题

　的　% 　 是多少?
　是　 的百分之多少?
　是多少的 %?
从 　到　 增加或减少了多少百分比?

Using the percentage calculator

This percentage calculator intends to answer 4 kinds of questions:
  1. 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"?
  2. 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?
  3. If we know the percentage of a in b, also know a, what is b?
  4. 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?