Change Invoice::Item price scale to 3 places

app/models/invoice.rb

@@ -82,7 +82,7 @@ class Invoice < ApplicationRecord
   end
 
   def vat_amount
-    subtotal * vat_rate / 100
+    (subtotal * vat_rate / 100)
   end
 
   def total
@@ -118,9 +118,8 @@ class Invoice < ApplicationRecord
 
     vat = VatRateCalculator.new(registrar: registrar_user).calculate
     wo_vat = (transaction.sum / (1 + (vat / 100)))
-
     registrar_user.issue_prepayment_invoice(wo_vat, 'Direct top-up via bank transfer',
-                                            payable: false, total: transaction.sum)
+                                            payable: false)
   end
 
   private
@@ -130,6 +129,6 @@ class Invoice < ApplicationRecord
   end
 
   def calculate_total
-    self.total = subtotal + vat_amount
+    self.total = (subtotal + vat_amount).round(3)
   end
 end

app/models/invoice_item.rb

@@ -5,7 +5,7 @@ class InvoiceItem < ApplicationRecord
   delegate :vat_rate, to: :invoice
 
   def item_sum_without_vat
-    (price * quantity).round(2)
+    (price * quantity).round(3)
   end
   alias_method :subtotal, :item_sum_without_vat
 
@@ -14,6 +14,6 @@ class InvoiceItem < ApplicationRecord
   end
 
   def total
-    subtotal + vat_amount
+    (subtotal + vat_amount)
   end
-end
+end

app/models/registrar.rb

@@ -54,7 +54,7 @@ class Registrar < ApplicationRecord
     end
   end
 
-  def issue_prepayment_invoice(amount, description = nil, payable: true, total: nil)
+  def issue_prepayment_invoice(amount, description = nil, payable: true)
     vat_rate = ::Invoice::VatRateCalculator.new(registrar: self).calculate
 
     invoice = invoices.create!(
@@ -90,7 +90,6 @@ class Registrar < ApplicationRecord
       buyer_email: email,
       reference_no: reference_no,
       vat_rate: vat_rate,
-      total: total,
       items_attributes: [
         {
           description: 'prepayment',