Three welders are hired at ₹900, ₹750 and ₹600 a day. The job runs for 14 days, but the second welder is absent on 4 of those days and the third on 6, and absent men are not paid. What is the total wage bill?

The first welder is paid for all 14 days: $900\times 14$ = ₹12,600. The second is paid for 10 days: $750\times 10$ = ₹7,500. The third is paid for 8 days: $600\times 8$ = ₹4,800. The bill is 12,600 + 7,500 + 4,800 = ₹24,900. ₹31,500 pays all three for the full 14 days $(2,250\times 14)$ and ignores the absences. ₹22,500 starts from that ₹31,500 and deducts all 10 absent days at the highest rate of ₹900. ₹24,000 makes the same deduction at ₹750 a day; each absence must be costed at the wage of the man who missed it.