I want to add increment of 6% to the return result from the query

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ASP.NET

ASP.NET2

MVC5

<td>Rs @(Model.lstItem.Sum(c => c._product.option != null ? (c._product.option.Price * c.Quantity) : (c._product.product.Price * c.Quantity))- (Model.coupon != null ? (int)Model.coupon.Discount : 0))</td>

first of all let me tell you i am totally new in asp.net mvc.. Now my question is i have the above query which is returning total after multiplying price and quantity. now what i want is i want to increment 6% of pricequantity to the pricequanity..

The final result will be like (price * quantity) + 6% of price * quanity..

i hope you guys understand my question

What I have tried:

Rs @(Model.lstItem.Sum(c => c._product.option != null ? (c._product.option.Price * c.Quantity + (c._product.option.Price * c.Quantity) / 100 * 6) : (c._product.product.Price * c.Quantity + (c._product.option.Price * c.Quantity) / 100 * 6))- (Model.coupon != null ? (int)Model.coupon.Discount : 0))