I get 2 errors CS1547 and CS1525

Hey guys..
I'm kinda new with unity and I was watching some tutorials on youtube. I was folowing the tutorial and I'm stuck with 2 errors and I can't solve them.

1. error CS1547: Keyword `void' cannot be used in this context
2. error CS1525: Unexpected symbol `(', expecting `)', `,', `;', `[', or `='

I checked the code multiple times still coudn't find the problem.. I did everything like the tutorial guy did and he didn't get the errors.. This is the code.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class ItemManager : MonoBehaviour {
5.    
6.     public UnityEngine.UI.Text itemInfo;
7.     public Click click;
8.     public float cost;
9.     public int tickValue;
10.     public int count;
11.     public string itemName;
12.     private float baseCost;
13.    
14.     void Start(){
15.         baseCost = cost;
16.         )
17.            
18.         void Update(){
19.             itemInfo.text = itemName + "\nCost: " + cost + "\nGold: " + tickValue + "/s";
20.             )
21.            
22.             public void PurchasedItem(){
23.                 if (click.Coin >= cost) {
24.                     click.Coin -= cost;
25.                     count += 1;
26.                     cost = Mathf.Round (baseCost * Mathf.Pow(1.15f, count));
27.                 }
28.     )
29. )                  
30.  
31.        

I get error CS1547 at line 22.
I get error CS1525 at line 16. and 20.

 

Function and class declarations must begin and end with brackets { }. You're using a bracket to open your functions and class, but to close them you're using a parenthesis.

Example:

Code (csharp):

1. void Start() {
2.      baseCost = cost;
3. }

 

It worked thank you very much.