A gang of workers normally consists of 10 skilled, 5 semi-skilled and 5 unskilled, paid at standard hourly rates of ₹40, ₹30 and ₹20, respectively. In a normal working week of 40 hours, the gang is expected to produce 1,000 units of output.

In a certain week, the gang consisted of 13 skilled, 4 semi-skilled and 3 unskilled, 72 hours were worked, actual wages paid amounted to ₹25,000, and 1,000 units of output were produced.

Present the information in respect of labour cost variance arising during this period.