[C#] implicit convert error

Hello,

I am getting the error "Assets/Scripts/Upgrades.cs(20,17): error CS0029: Cannot implicitly convert type 'string' to 'UnityEngine.UI.Text'". The corresponding script is the following:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class Upgrades : MonoBehaviour {
 
     public ClickScript click;
     public Text itemInfo;
     public float cost;
     public int count = 0;
     public int clickPower;
     public string itemName;
     private float baseCost;
 
     void Start(){
         baseCost = cost;
     }
 
     void Update(){
         itemInfo = itemName + "\nCost: " + cost + "\nPower: +" + clickPower;
     }
 
     public void PurchasedUpgrade(){
         if (click.Money >= cost) {
             click.Money -= cost;
             count++;
             click.MoneyPerClick += clickPower;
             cost = baseCost * Mathf.Pow(1.30f, count); 
         }
     }
 }