Jeopardy Jester - S1.E3

Rajguru has a slave bonded by a contract, which states that the slave cannot free himself from servitude unless he pays the mentioned amount of gold coins to Rajguru. The issue is brought to the kind King Krishnadevaraya, but the he is helpless due to the influence of the contract. Raman feels compassionate towards the servant, and volunteers to serve Rajguru instead. What is Tenali's plan?