diff --git a/app/models/spree/calculator/price_sack_decorator.rb b/app/models/spree/calculator/price_sack_decorator.rb
index 41aeabf330..b474f77861 100644
--- a/app/models/spree/calculator/price_sack_decorator.rb
+++ b/app/models/spree/calculator/price_sack_decorator.rb
@@ -17,9 +17,9 @@ module Spree
       order_amount = line_items_for(object).map { |x| x.price * x.quantity }.sum
 
       if order_amount < min
-        cost = preferred_normal_amount.to_i
+        cost = preferred_normal_amount.to_f
       elsif order_amount >= min
-        cost = preferred_discount_amount.to_i
+        cost = preferred_discount_amount.to_f
       end
 
       cost
diff --git a/spec/models/spree/calculator/price_sack_spec.rb b/spec/models/spree/calculator/price_sack_spec.rb
index 9b0a38d0e8..921b657f88 100644
--- a/spec/models/spree/calculator/price_sack_spec.rb
+++ b/spec/models/spree/calculator/price_sack_spec.rb
@@ -8,11 +8,11 @@ describe Spree::Calculator::PriceSack do
     calculator.preferred_discount_amount = 1
     calculator
   end
-
   let(:line_item) { build(:line_item, price: price, quantity: 2) }
 
   context 'when the order amount is below preferred minimal' do
     let(:price) { 2 }
+
     it "uses the preferred normal amount" do
       expect(calculator.compute(line_item)).to eq(10)
     end
@@ -20,11 +20,35 @@ describe Spree::Calculator::PriceSack do
 
   context 'when the order amount is above preferred minimal' do
     let(:price) { 6 }
+
     it "uses the preferred discount amount" do
       expect(calculator.compute(line_item)).to eq(1)
     end
   end
 
+  context "preferred discount amount is float" do
+    before do
+      calculator.preferred_normal_amount = 10.4
+      calculator.preferred_discount_amount = 1.2
+    end
+
+    context 'when the order amount is below preferred minimal' do
+      let(:price) { 2 }
+
+      it "uses the float preferred normal amount" do
+        expect(calculator.compute(line_item)).to eq(10.4)
+      end
+    end
+
+    context 'when the order amount is above preferred minimal' do
+      let(:price) { 6 }
+
+      it "uses the float preferred discount amount" do
+        expect(calculator.compute(line_item)).to eq(1.2)
+      end
+    end
+  end
+
   context "extends LocalizedNumber" do
     it_behaves_like "a model using the LocalizedNumber module", [:preferred_minimal_amount, :preferred_normal_amount, :preferred_discount_amount]
   end