16.
A contracts to sing for B at a concert for 1,000 rupees which are paid in advance. A is too ill to sing-

17.
When one person signifies to another his willingness to do or to abstain from doing any thing with a view to obtaining the assent of that other person to such act or abstinence he is said to make a

18.
A, a man enfeebled by disease or age, is induced by B's influence over him as his medical attendant, to agree to pay B an unreasonable sum for his professional services, B employs:

19.
The liquidated damages are essentially-