Section 3
Section 3. Only un-manufactured articles, materials, or supplies of the growth or production of the Philippines or the United States, and only such manufactured articles, materials, or supplies as have been manufactured in the Philippines or in the Unites States, substantially from articles, materials, or supplies of the growth, production, or manufacture, as the case may be, of the Philippines or of the United States, shall be purchased for public use and, in case of bidding, subject to the following: (a) When the lowest foreign bid, including customs duties, does not exceed two pesos, the award shall be made to the lowest domestic bidder, provided his bid is not more than one hundred per centum in excess of the foreign bid; (b) When the lowest foreign bid, including customs duties, exceeds two pesos but does not exceed twenty pesos, the award shall be made to the lowest domestic bidder, provided his bid is not more than fifty per centum in excess of the lowest foreign bid; (c) When the lowest foreign bid, including customs duties, exceeds twenty pesos but does not exceed two hundred pesos, the award shall be made to the lowest domestic bidder, provided his bid is not more than twenty-five per centum in excess of the lowest foreign bid; (d) When the lowest foreign bid, including customs duties, exceeds two hundred pesos but does not exceed two thousand pesos, the award shall be made to the lowest domestic bidder, provided his bid is not more than twenty per centum in excess of the lowest foreign bid; (e) When the lowest foreign bid, including customs duties, exceeds two thousand pesos, the award shall be made to the lowest domestic bidder, provided his bid is not more than fifteen per centum in excess of the lowest foreign bid.