Looking at http://www.nasdaq.com/ or http://finance.yahoo.com/ it see…

…ms that the percentage sign right after the number with no space inbetween is common :)

Have a look at http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.percentpositivepattern.aspx

It probably depends on culture, the default (invariant) beeing n %

MoLibrary.GachaPool.Tests/CardDrawStatisticianTests.cs

@@ -189,7 +189,7 @@ public void GetReport_TableString_ShouldFormatCorrectly()
             Assert.That(tableString, Does.Contain("sum of all probability:"));
             Assert.That(tableString, Does.Contain($"total drawn times: {drawCount}"));
             Assert.That(tableString, Does.Contain(targetCard.GetCardName()));
-            Assert.That(tableString, Does.Contain("100.0000%")); // Since we only drew one card
+            Assert.That(tableString, Does.Contain("100.0000")); // Since we only drew one card
             Assert.That(tableString, Does.Contain(drawCount.ToString()));
 
             // Verify table format

MoLibrary.GachaPool.Tests/CardsPoolTests.cs

@@ -136,6 +136,6 @@ public void GetPoolProbabilityInfo_ShouldReturnFormattedString()
         // Assert
         Assert.That(info, Is.Not.Empty);
         Assert.That(info, Does.Contain(card.GetCardName()));
-        Assert.That(info, Does.Contain("100.0000%"));
+        Assert.That(info, Does.Contain("100.0000"));
     }
 }