(d)has evaded in any way the liability to pay tax, he may direct that such dealer shall pay by way of penalty, in addition to the tax payable by him, a sum not exceeding one and a half times that amount [but] [Inserted by The Tripura Sales Tax (Second Amendment) Act, 1981, w. e. f. 4.5.1981.] which shall not be less than 10% of that amount ;