Hi,

At the point 10 (Architect Arithmetic challenge) why is the cost 748510782.02 pesos?

I got different result but I can’t figure out why?

My result is: 718637251.82 peso

## Here is my code:

```
using System;
namespace ArchitectArithmetic
{
class Program
{
public static void Main(string[] args)
{
// for test:
/*
Console.WriteLine(RectangularArea(5, 4));
Console.WriteLine(CircleArea(4));
Console.WriteLine(TriangleArea(10, 9));
*/
double rect = RectangularArea(1500, 2500);
double halfCircle = CircleArea(375 / 2) / 2;
double triangle = TriangleArea(750, 500);
double areaOfTeotihuacan = rect + halfCircle + triangle;
double flooringCost = areaOfTeotihuacan * 180; // in Mexican peso
Console.WriteLine($"The area of Teotihuacan is: {areaOfTeotihuacan} square metre.");
Console.WriteLine($"The flooring-cost is: {Math.Round(flooringCost, 2)} Mexican peso.");
Console.WriteLine($"The flooring-cost is: {CalculateTotalCost(areaOfTeotihuacan, 180)} Mexican peso.");
}
static double RectangularArea(double length, double width) {
return length * width;
}
static double CircleArea(double radius) {
return Math.PI * Math.Pow(radius, 2);
}
static double TriangleArea(double bottom, double height) {
return 0.5 * bottom * height;
}
static double CalculateTotalCost(double area, double price) {
return Math.Round(area * price, 2);
}
}
}
```