Sachin alone can complete a piece of work forts ₹8,500 in $8\frac{1}{2}$ days. But with the help of Vishnu, the work is completed in 6 days. The share to be paid to Vishnu is:

₹2,500

Sachin = 8.5 days,

Vishnu + Sachin = 6 days,

⇒ Sachin + Vishnu = 17,  (Efficiency)

⇒ 12 + Vishnu = 17,

⇒ Vishnu = 5,

⇒ Total amount = Rs. 8500,

⇒ 17x = 8500,

⇒ x = Rs. 500,

⇒ Vishnu's Share = 5 x 500 = Rs. 2500.