[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 + "

Cost: " + cost + "
Power: +" + clickPower;
}

	public void PurchasedUpgrade(){
		if (click.Money >= cost) {
			click.Money -= cost;
			count++;
			click.MoneyPerClick += clickPower;
			cost = baseCost * Mathf.Pow(1.30f, count); 
		}
	}
}

iteminfo is a class (UI.Text). You want to assign the text property in the class (UI.Text.text).

itemInfo.text =  itemName + "

Cost: " + cost + "
Power: +" + clickPower;