Have you read my reply above? Minimum wages mean gross wages paid to employees, excluding HRA as it is a compulsory allowance in Maharashtra and WB for organizations employing 50 or more employees.
The basic wage in Maharashtra and most of the states is based on the skill required for performing the job. The actual job of performing housekeeping is unskilled. The duties the office attendant is required to discharge will determine whether he is unskilled, semi-skilled, or skilled. You need to be a dispassionate judge as you will have to justify your decision when questioned by authority, if at all.