Merge branch '27-difference-on-download-pdf-should-multiply-100' into 'init19'

Resolve "difference on download pdf should multiply 100"

Closes #27

See merge request !18

app/lib/sample_pdf.rb

@@ -114,7 +114,7 @@ class SamplePdf < Prawn::Document
      elsif e == 0
        'NaN'
      else
-      "%.2f" % ((m - e).abs/e).round(2)
+      "%.2f" % ((m - e).abs/e * 100).round(2)
     end
   end