The Commissioner who determined the compensation, therefore, was justified in directing the amount to be paid within 30 days and on failure to pay interest @ 9%. There could not be a direction for penalty without giving prior notice to show cause as to why penalty should not be imposed. There was surely no contumacious conduct on the part of the respondents to make the respondents liable for penalty. Although an argument was made by the respondents that the appeal itself was not maintainable under Section 30(aa) of the Workmen's Compensation Act, I will not find any such bar as operating against the workman. Section 30 contemplates the grounds on which appeal can be preferred and the appeal is possible also against the imposition of interest and penalty. This must be understood in such a way that even want of provision for interest and penalty could be a ground for an appeal. Either way, the appeal was maintainable but in this case I find that there was no justification for imposition of any imposition or interest other than the manner in which the Commissioner has already provided.