add tax profiles api

app/models/tax_profile.rb

@@ -4,4 +4,22 @@ class TaxProfile < ApplicationRecord
   default_scope { order('order_by asc') }
   # validations
   validates_presence_of :name, :rate, :group_type
+
+  def self.calculate_tax(group_type)
+    divided_value =0.0
+    exclusive =0.0
+    tax_profiles = TaxProfile.where(group_type: group_type, tax_type: 'Percentage')
+    if !tax_profiles.empty?
+      tax_profiles.each do |tax|
+        #include or execulive
+        if tax.inclusive
+          rate = tax.rate.to_f
+          divided_value += (100 + rate)/rate
+        else
+          exclusive += tax.rate.to_f / 100
+        end
+      end
+    end
+    return divided_value,exclusive
+  end
 end