I am able to get the answer, but I am getting a result with a message:

Test: $`$ClassifiedAd$`$ class test

Reason: Unable to run tests.

Error : str $-$ AssertionError

Can some one assist me please.

using System;

using static System.Console;

using System.Globalization;

class TestClassifiedAd

$\{$

static void Main$()$

$\{$

ClassifiedAd ad$\_$C $=$ new ClassifiedAd$()$;

ad$\_$C$.$Category $=$ "Used Cars";

ad$\_$C$.$NumWords $=100$;

ClassifiedAd ad$\_$H $=$ new ClassifiedAd$()$;

ad$\_$H$.$Category $=$ "Help Wanted";

ad$\_$H$.$NumWords $=60$;

WriteLine$("$The classified ad with $\{0\}$ words in category $\{1\}$ costs $\{2\}",$ ad$\_$C$.$NumWords, ad$\_$C$.$Category, ad$\_$C$.$Price.ToString$("$C$",$ CultureInfo.GetCultureInfo$("$en$-$US$")))$;

WriteLine$("$The classified ad with $\{0\}$ words in category $\{1\}$ costs $\{2\}",$ ad$\_$H$.$NumWords, ad$\_$H$.$Category, ad$\_$H$.$Price.ToString$("$C$",$ CultureInfo.GetCultureInfo$("$en$-$US$")))$;

$\}$

$\}$

public class ClassifiedAd

$\{$

public string Category $\{$ get; set; $\}$

public int NumWords $\{$ get; set; $\}$

public double Price

$\{$

get $\{$ return NumWords $*0\mathrm{.}09$; $\}$

$\}$

$\}$