To find the mean daily wages, we use the Direct Method. First, we calculate the class mark ($x_i$) for each class interval by finding the midpoint (average of upper and lower limits).

The calculation table is as follows:

• For 500-520: $x_i = 510$, $f_i x_i = 12 \times 510 = 6120$
• For 520-540: $x_i = 530$, $f_i x_i = 14 \times 530 = 7420$
• For 540-560: $x_i = 550$, $f_i x_i = 8 \times 550 = 4400$
• For 560-580: $x_i = 570$, $f_i x_i = 6 \times 570 = 3420$
• For 580-600: $x_i = 590$, $f_i x_i = 10 \times 590 = 5900$

The total number of workers is $\Sigma f_i = 50$ and the sum of the product of values is $\Sigma f_i x_i = 27260$.

Using the formula: Mean ($\bar{x}$) = $\frac{\Sigma f_i x_i}{\Sigma f_i} = \frac{27260}{50} = 545.2$

Therefore, the mean daily wage of the workers is ₹ 545.20.