Ребят помогите чтобы умножалась не на целое а на десятичное decimal!!!

using UnityEngine;
using UnityEngine.UI;
public class Game : MonoBehaviour
{
    public Text scoreText;
    [Header("Магазин")]
    public int[] shopcosts;
    public int[] shopBonuses;
    public Text[] ShopBttnsText;
    public GameObject shopPan;
    public Text viewBonus;

    public decimal score = 0.000m;
    public int bonus;


    private void Start()
    {
        score = decimal.Parse(PlayerPrefs.GetString("score", "0"));
        bonus = PlayerPrefs.GetInt("bonus", 0);
        for (int i = 0; i < shopcosts.Length; i++)
        {
            shopcosts[i] = PlayerPrefs.GetInt("shopcosts" + i, shopcosts[i]);
        }
    }

    private void Update()
    {
        scoreText.text = score + "$";
        viewBonus.text = "Улучшений куплено: " + bonus;
        for (int i = 0; i < shopcosts.Length; i++)
        {
            ShopBttnsText[i].text = "Кликер\n" + shopcosts[i] + "$";
        }
    }
    public void _shopPan ()
    {
        shopPan.SetActive(!shopPan.activeSelf);
    }

    public void ShopBttn_addBonus(int index)
    {
        if (score >=shopcosts[index])
        {
            bonus += shopBonuses[0];
            PlayerPrefs.SetInt("bonus", bonus);
            score -= shopcosts[index];
            shopcosts[index] *= 2;
            for (int i = 0; i < shopcosts.Length; i++)
            {
                PlayerPrefs.SetInt("shopcosts" + i,  shopcosts[i]);
            }
            ShopBttnsText[index].text = "Кликер\n" + shopcosts[index] + "$";
        }
        else
        {
            Debug.Log("Недостаточно средств!");
        }
    }

    public void OnClick ()
    {
        score = score + 0.001m + bonus;
        PlayerPrefs.SetString("score", score.ToString());
    }
}

shopcosts[index] *= 2;