using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        List<Animals> animalList = new List<Animals>()

        {

             new Animals() { AnimalType = "Lion", FoodRatio = 5, PreferredFood = "meat", FruitRatio = 5},

             new Animals() { AnimalType = "Tiger", FoodRatio = 4 , PreferredFood = "meat", MeatRatio = 5 },

             new Animals() { AnimalType  = "Giraffe", FoodRatio = 3, PreferredFood = "fruit", FruitRatio = 2 }, 

             new Animals() { AnimalType = "Piranha", FoodRatio = 5, PreferredFood = "fruit", MeatRatio = 2 },

            new Animals() { AnimalType = "Piranha", FoodRatio = 5, PreferredFood = "meat", FruitRatio = 2 }

        };

​

        List<Prices> priceList = new List<Prices>() 

        {

            new Prices() { FoodType = "meat", Price = 1000 },

            new Prices() { FoodType = "fruit", Price = 2000 }

        };

        var totalCost = (from animal in animalList 

           join price in priceList

           on animal.PreferredFood equals price.FoodType

           group new { Animal = animal, Price = price } by animal.AnimalType into g

           select new 

            {

                AnimalType = g.Key,

                Price = g.Sum(x => x.Price.Price * x.Animal.FruitRatio + x.Animal.MeatRatio * x.Price.Price)

            }).ToList();

        Console.WriteLine(JsonConvert.SerializeObject(totalCost.ToList(), Formatting.Indented));

    }

}

​

public class Prices

{

    public string FoodType { get; set; }

    public decimal Price { get; set; }

}

​

internal class Animals

{

    public string AnimalType { get; set; }

​

    public decimal FoodRatio { get; set; }

​

    public string PreferredFood { get; set; }

​

    public string? OmnivoreMeatRatio { get; set; }

    public decimal? MeatRatio { get; set; }

    public decimal? FruitRatio { get; set; }

}

​