Get the percentage of the discount value in c#

Question

In my applicattion i want to find how much in percent is the discount, I have the price of an item then when i give a new price and find the Subtraction I want to know how much is that in percent, example:

decimal realPrice = 1800;
decimal newPrice = 1700;
decimal difference = realPrice - newPrice; // = 100
decimal discountPercent = ????;

How many percent is this diffence as a discount in percent from the realprice. Thank you in advance.

Answer 1

You should divide difference by realPrice and then multiply it by 100 to get percentages

decimal discountPercent = difference / realPrice * 100;

It should give you 5.(5)%

Answer 2

See this working example

decimal discountPercent = (difference / realPrice) * 100;
Console.WriteLine("Discount Percentage : {0}%",discountPercent.ToString("#.##"));

Little maths for explanation:

Answer 3

decimal discountPercent = difference / realPrice * 100;

Though this is not a programming question, but rather math question for middle school. :D