If Then Calculator

If Then Calculator is not a calculator as we know it. It is designed only for calculating proportions.It simply gets you the value of ? in this equation:"If X Foo equals to Y bla, then Z Foo equals to ? bla"It works for 2 ways of proportions: Direct and inverse.For example when you make a calculation about prices, the result usually increases like this:If 2 apples cost 10 bucks, 5 apples cost how many bucks?The app finds 25 bucks here (which is greater than 10).But when you make a calculation for ex. about speed, the result decreases like this:If 3 workers finish the job in 15 days, 9 workers will finish in how many days?The app finds 5 days here (which is less than 15).Simple but useful, all free.