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MVC3 model DisplayFormat and JSON
[DisplayFormat(DataFormatString = "{0:P2}")]
public Nullable<double> Yearly_act_pct { get; set; }

@Html.DisplayFor(modelItem => item.Yearly_act_pct)

return Json(myObjects, JsonRequestBehavior.AllowGet);

JavaScriptSerializer serializer = new JavaScriptSerializer();
response.Write(serializer.Serialize(Data));

myObjects.Yearly_act_pct = Math.Round(myObjects.Yearly_act_pct, 2); // provided you wanted to round to nearest two fractional digits
return Json(myObjects, JsonRequestBehavior.AllowGet);

[DataMember(Name = "price", Order = 23)]
    [XmlElement("price", Order = 23)]
    public string Price_String
    {
        get
        {
            return Formatter.FormatAsCurrency(this.Price);
        }
        set
        {
            this.Price = Formatter.ParseCurrency(value);
        }
    }

    [XmlIgnore]
    public decimal Price { get; set; }

public static string FormatAsCurrency(decimal? amount)
    {
        return amount.HasValue ? String.Format("{0:C}USD", amount).Replace("$","") : null;
    }
    public static decimal ParseCurrency(string value)
    {
        return !String.IsNullOrEmpty(value) ? decimal.Parse(value.Replace("USD", "")) : 0;
    }
    public static decimal? ParseNullableCurrency(string value)
    {
        return !String.IsNullOrEmpty(value) ? decimal.Parse(value.Replace("USD", "")) as decimal? : null;
    }

public ContentResult GetContentResult(object responseObject)
    {
        #region Output Format
        if (this.ResponseFormat == ResponseFormatEnum.JSON)
        {
            string json = "";

            try
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer jsonserializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(responseObject.GetType());
                MemoryStream ms = new MemoryStream();
                jsonserializer.WriteObject(ms, responseObject);
                json = Encoding.Default.GetString(ms.ToArray());
                ms.Close();
                ms.Dispose();
                jsonserializer = null;
            }
            catch(System.Exception ex)
            {
                string err = ex.Message;
            }

            return new ContentResult() { Content = json, ContentType = "application/json" };

        }
        else
        {
            string xml = "";
            try
            {
                MemoryStream ms = new MemoryStream();
                System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(responseObject.GetType());
                System.Xml.Serialization.XmlSerializerNamespaces ns = new System.Xml.Serialization.XmlSerializerNamespaces();
                ns.Add("", "");
                ms = new MemoryStream();
                serializer.Serialize(ms, responseObject, ns);
                xml = Encoding.Default.GetString(ms.ToArray()); ms.Close();
                ms.Dispose();
                serializer = null;
            }
            catch (System.Exception ex)
            {
                throw ex;
            }

            return new ContentResult() { Content = xml, ContentType = "text/xml" };
        }
        #endregion
    }

public ActionResult Feed()
    {
        ViewModels.API.Deals.Response response = new ViewModels.API.Deals.Get();
        return GetContentResult(response);
    }