Explanation

Let's break it down step by step:

1. 4 boys = 5 girls, so 1 boy = 1.25 girls (since 5/4 = 1.25)
2. 2 women = 3 boys, so 1 woman = 1.5 boys (since 3/2 = 1.5)
3. 1 woman = 1.5 boys = 1.5 x 1.25 girls = 1.875 girls (since 1 boy = 1.25 girls)
4. 6 men = 7 women, so 1 man = 1.167 women (since 7/6 = 1.167)
5. Since 1 woman = 1.875 girls, 1 man = 1.167 x 1.875 girls = 2.188 girls
6. If a girl earns Rs. 400 per week, a man earns Rs. 2.188 x 400 = Rs. 875.20 per week
7. Daily earnings of a man = Rs. 875.20 / 7 = Rs. 125.00

So, the correct answer is Rs. 125.00.