So here it is. i want an refiner that if the item is already +4 and the player wants to upgrade it, it will cost 
5 proof of donation for +5 with a 100% chance  
  
 if the item is already +5 and the player wants to upgrade it, it will cost  
10 proof of donation for +6 with a 100% chance 
  
 if the item is already +6 and the player wants to upgrade it, it will cost  
15 proof of donation for +7 with a 80% chance( will announce "player name" has upgrade +7 "item") 
  
 if the item is already +7 and the player wants to upgrade it, it will cost  
16 proof of donation for +8 with a 70% chance ( will announce "player name" has upgrade +8 "item") 
  
 if the item is already +8 and the player wants to upgrade it, it will cost  
18 proof of donation for +9 with a 60% chance ( will announce "player name" has upgrade +9 "item") 
  
 if the item is already +9 and the player wants to upgrade it, it will cost  
20 proof of donation for +10 with a 50% chance ( will announce "player name" has upgrade +10 "item")