diff --git a/app/helpers/ReadingsMailer.rb b/app/helpers/ReadingsMailer.rb
index 05b48be..07ec11c 100644
--- a/app/helpers/ReadingsMailer.rb
+++ b/app/helpers/ReadingsMailer.rb
@@ -28,6 +28,9 @@ class ReadingsMailer
     c = Cost.new
     oxxio_cost = c.oxxio_energy_cost(date.to_s,usage_today[:total_kwh_consumed_high]-usage_today[:total_kwh_produced_high], usage_today[:total_kwh_consumed_low]-usage_today[:total_kwh_produced_low])
     easy_cost = c.easy_energy_cost_barplot(date) # side effect: generates a PNG
+    # rounding
+    oxxio_cost = oxxio_cost.round(2)
+    easy_cost = easy_cost.round(2)
     
     mail = Mail.new do
         delivery_method :smtp, smtp_opts
@@ -53,9 +56,13 @@ class ReadingsMailer
                "<p>Total kWH electricity produced:  #{usage_today[:total_kwh_produced_high] + usage_today[:total_kwh_produced_low]}</p>" +
                "<p>Total m3 gas consumed: #{usage_today[:total_m3_gas_consumed]}</p>" +
                "</br>" +
-               "<p>kWH cost (Oxxio): EUR #{ oxxio_cost} </p>" +
-               "<p>kWH cost (EasyEnergy): EUR #{ easy_cost} </p>"
-        end  
+               "<p>kWH cost (Oxxio): <b>EUR #{ oxxio_cost} </b></p>" +
+               "<p>kWH cost (EasyEnergy): <b>EUR #{ easy_cost} </b></p>"
+        end 
+        
+        # add attachment
+        filename = "easy_cost_%s.png" % date.strftime("%F")
+        add_file :filename => filename, :content => File.read("plots/%s" % filename) 
       end
       
       mail.deliver!