diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9371208b..85940de69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 - Fix a bug: unable to build homepage custom stylesheet
 - Fix a bug: unable to access embedded plan views
 - Fix a bug: warning message overflow in credit wallet modal
+- Fix a bug: when a cash coupon was used, an invalid amount is shown in the statistics
 - [TODO DEPLOY] `rails fablab:stripe:plans_prices`
 - [TODO DEPLOY] `rails fablab:maintenance:rebuild_stylesheet`
 
diff --git a/app/services/coupon_service.rb b/app/services/coupon_service.rb
index dde414508..68287c727 100644
--- a/app/services/coupon_service.rb
+++ b/app/services/coupon_service.rb
@@ -53,8 +53,8 @@ class CouponService
 
   ##
   # Ventilate the discount of the provided coupon over the given amount proportionately to the invoice's total
-  # @param total {Number} total amount of the invoice expressed in monetary units
-  # @param amount {Number} price of the invoice's sub-item expressed in monetary units
+  # @param total {Number} total amount of the invoice expressed in centimes
+  # @param amount {Number} price of the invoice's sub-item expressed in centimes
   # @param coupon {Coupon} coupon applied to the invoice, amount_off expressed in centimes if applicable
   ##
   def ventilate(total, amount, coupon)
@@ -64,7 +64,7 @@ class CouponService
         price = amount - (amount * coupon.percent_off / 100.00)
       elsif coupon.type == 'amount_off'
         ratio = (coupon.amount_off / 100.00) / total
-        discount = amount * ratio.abs
+        discount = (amount * ratio.abs) * 100
         price = amount - discount
       else
         raise InvalidCouponError
@@ -77,9 +77,9 @@ class CouponService
   # Compute the total amount of the given invoice, without the applied coupon
   # Invoice.total stores the amount payed by the customer, coupon deducted
   # @param invoice {Invoice} invoice object, its total before discount will be computed
+  # @return {Number} total in centimes
   ##
   def invoice_total_no_coupon(invoice)
-    total = (invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+) or 0)
-    total / 100.0
+    invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+) or 0
   end
 end
diff --git a/app/services/statistic_service.rb b/app/services/statistic_service.rb
index 5b4c8725a..acf0cc895 100644
--- a/app/services/statistic_service.rb
+++ b/app/services/statistic_service.rb
@@ -134,9 +134,10 @@ class StatisticService
 
       next unless sub
 
-      ca = i.amount.to_i / 100.0
+      ca = i.amount.to_i
       cs = CouponService.new
       ca = cs.ventilate(cs.invoice_total_no_coupon(i.invoice), ca, i.invoice.coupon) unless i.invoice.coupon_id.nil?
+      ca /= 100.00
       profile = sub.statistic_profile
       p = sub.plan
       result.push OpenStruct.new({
diff --git a/test/fixtures/coupons.yml b/test/fixtures/coupons.yml
index 41d78d4f4..f2d485c34 100644
--- a/test/fixtures/coupons.yml
+++ b/test/fixtures/coupons.yml
@@ -25,4 +25,13 @@ cash:
   valid_until: <%= 1.year.from_now.utc.strftime('%Y-%m-%d %H:%M:%S.%9N Z') %>
   max_usages: 1
   active: true
-  validity_per_user: once
\ No newline at end of file
+  validity_per_user: once
+
+cash2:
+  name: Small Cash Code
+  code: GIME3EUR
+  amount_off: 300
+  valid_until: <%= 1.year.from_now.utc.strftime('%Y-%m-%d %H:%M:%S.%9N Z') %>
+  max_usages: nil
+  active: true
+  validity_per_user: once
diff --git a/test/services/coupon_service_test.rb b/test/services/coupon_service_test.rb
index 884145caa..17bac44a6 100644
--- a/test/services/coupon_service_test.rb
+++ b/test/services/coupon_service_test.rb
@@ -1,5 +1,8 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
+# In the following tests, amounts are expressed in centimes, ie. 1000 = 1000 cts = 10,00 EUR
 class CouponServiceTest < ActiveSupport::TestCase
   setup do
     @jdupond = User.find_by(username: 'jdupond')
@@ -25,4 +28,16 @@ class CouponServiceTest < ActiveSupport::TestCase
     total = CouponService.new.apply(1000, 'XMAS10', @jdupond.id)
     assert_equal 1000, total
   end
+
+  test 'ventilate 15 percent coupon' do
+    coupon = Coupon.find_by(code: 'SUNNYFABLAB')
+    total = CouponService.new.ventilate(1000, 500, coupon)
+    assert_equal 425, total
+  end
+
+  test 'ventilate 100 euros coupon' do
+    coupon = Coupon.find_by(code: 'GIME3EUR')
+    total = CouponService.new.ventilate(1000, 500, coupon)
+    assert_equal 350, total
+  end
 end