Dapper - How to return custom colum value

I have a class named "order"

public class order{
 public string INTERNET_PRICE{get;set;}
 public string SUGGEST_PRICE{get;set;}
}

Then I want using Dapper to select a new column named "Total"

Total column's value is INTERNET_PRICE + SUGGEST_PRICE

If I cannot add new member to order class or create new class.

Is there have some way can do this?

    using(var connection=this.Connection){
    var sql=@"select INTERNET_PRICE,SUGGEST_PRICE,
                INTERNET_PRICE+SUGGEST_PRICE as Total
            from BS_GOODS_CHANGEPRICE";
    var result=connection.Query<order>(sql);
    result.Dump();
}