Viking Island/Buydown

Buy Down Cost
 * Each quest has 10 pieces of the glass to be broken. 4 pieces will get broken by Gold.png or Deus food.png, while two other 3 pieces will get broken by Hammer.png or Horn.png or Helmet.png.
 * Description: The first value of each column is cost of single buy (break 1 piece of glass). The second value (in bracet) is cost of buy all, suppose only this item type left (other types are done).
 * Formula: The cost of current BUY ALL = SUM of all remaining single buy down * 0.85 (discount 15%). The value will be rounded up to the nearest larger integer (ceiling).