Created Unassigned: ClearScript V8ScriptEngine Arithmetic [63]

Hello,

I need help about clearscript. I am using class and this class has a variable. Example is under.

public class DataDict
{
public decimal AmountPenetrationBonus { get; set; }
public decimal TermFactor { get; set; }
public decimal ConstantBonus { get; set; }
public decimal BonusForOtherCreditTypes { get; set; }
public decimal CampaignExponent { get; set; }
public String Formula { get; set; }
}

DataDict dataDict = new DataDict();
dataDict.AmountPenetrationBonus = 5;
dataDict.TermFactor = 2;
dataDict.ConstantBonus = 3;
dataDict.BonusForOtherCreditTypes = 4;
dataDict.CampaignExponent = 2;
dataDict.Formula = AmountPenetrationBonus*TermFactor *ConstantBonus ;

and my script is
using (var engine = new V8ScriptEngine())
{

engine.AddHostObject("DataDict", dataDict);
engine.Execute(@"AmountPenetrationBonus= DataDict.AmountPenetrationBonus;
TermFactor=DataDict.TermFactor;
ConstantBonus = DataDict.ConstantBonus;
BonusForOtherCreditTypes=DataDict.BonusForOtherCreditTypes;
CampaignExponent = DataDict.CampaignExponent;
result = DataDict.Formula;
");
var result = engine.Script.result;
}
but return the result value =AmountPenetrationBonus*TermFactor *ConstantBonus , it was be 5*2*3 than return to me 30. engine.Script.result return to me the string value doesnt decimal value.
Please help about this problem.

Thanks for help and sorry for my english.