Calculate percentage in ruby ??

Question

Is there any method available to calculate percentage in rails or ruby ??

EDIT:

I am looking for a function like ..

100000.percent(10) will return me 10000.

100000 is value ..(value is BigDecimal) 10 % ..

result = 100000 * 10 / 100

result = 10000 ..

Answer 1

You mean like this percentage = a/b*100?

Update based on your new description:

class Numeric
  def percent_of(n)
    self.to_f / n.to_f * 100.0
  end
end

# Note: the brackets around number (ie. (1)) are optional
p (1).percent_of(10)    # => 10.0  (%)
p (200).percent_of(100) # => 200.0 (%)
p (0.5).percent_of(20)  # => 2.5   (%)

pizza_slices = 5
eaten = 3
p eaten.percent_of(pizza_slices) # => 60.0 (%)

Based on Mladen's code.

Answer 2

There is a method. Here it is:

class Numeric
  def percents
    self * 100
  end
end

0.56.percents
=> 56.0