Custom Duty in India. Custom duty India came into existence under the Customs Act, 1962 & allows the government of India to levy customs duty on imports and exports, prohibit import and export of goods, procedures for importing or exporting & offenses, penalties, etc. The price at which a competitor sells your book is lower than your list price. The price at which we sell a physical edition of your book is lower than your list price. How does this affect your royalties? If you chose the 70% royalty option, your royalties will be calculated off this offer price for sales that qualify for the 70% royalty option.