introduces format_percentage in ReportRowBuilder#format_cell

config/locales/en.yml

@@ -1373,6 +1373,7 @@ en:
       total_by_customer: Total By Customer
       total_by_supplier: Total By Supplier
       supplier_totals: Order Cycle Supplier Totals
+      percentage: "%{value} %"
       supplier_totals_by_distributor: Order Cycle Supplier Totals by Distributor
       totals_by_supplier: Order Cycle Distributor Totals by Supplier
       customer_totals: Order Cycle Customer Totals

lib/reporting/report_row_builder.rb

@@ -85,6 +85,9 @@ module Reporting
       # Numeric
       elsif report.columns_format[column] == :numeric
         format_numeric(value)
+      # Percentage, a number between 0 and 1
+      elsif report.columns_format[column] == :percentage
+        format_percentage(value)
       # Boolean
       elsif value.in? [true, false]
         format_boolean(value)
@@ -124,5 +127,11 @@ module Reporting
     def format_numeric(value)
       number_with_delimiter(value)
     end
+
+    def format_percentage(value)
+      return '' if value.blank?
+
+      I18n.t('admin.reports.percentage', value: value * 100)
+    end
   end
 end

lib/reporting/reports/sales_tax/sales_tax_totals_by_producer.rb

@@ -51,6 +51,12 @@ module Reporting
           }
         end
 
+        def columns_format
+          {
+            tax_rate: :percentage
+          }
+        end
+
         def rules
           [
             {
@@ -108,10 +114,7 @@ module Reporting
         end
 
         def tax_rate_amount(query_result_row)
-          amount = tax_rate(query_result_row)&.amount
-          return if amount.nil?
-
-          "#{amount * 100} %"
+          tax_rate(query_result_row)&.amount
         end
 
         def total_excl_tax(query_result_row)