Where the department is satisfied (1) that the employer is unable to make payment in full of contributions, interest and penalties imposed upon him by the law, or that it would be inequitable to require the payment in full of delinquent interest, and (2) that the employer has acted in good faith, the secretary is hereby authorized, to compromise delinquent interest and penalties due on any contribution, and, in the case of any employer that has been adjudged a bankrupt or for whom a receiver has been appointed or a deceased employer for whom an executor or administrator has been designated, to compromise the principal of any delinquent contribution as well as interest and penalties thereon: Provided, That any compromise of a total delinquent amount in excess of one thousand dollars shall require the approval of the Attorney General.