4. Every such carrier may require payment for the risk undertaken in carrying property exceeding in value one hundred taka and of the description aforesaid, at such rate of charge as he may fix:Provided that, to entitle such carrier to payment at a rate higher than his ordinary rate of charge, he shall have caused to be exhibited in the place where he carries on the business of receiving property to be carried, notice of the higher rate of charge required, printed or written in English and in the vernacular language of the country wherein he carries on such business.