law: Sale of Goods Act, 1930
  32. Payment and delivery are concurrent conditions
  Unless otherwise agreed, delivery of the goods and payment of
  
  the price are concurrent conditions, that is to say, the seller shall be ready
  
  and willing to give possession of the goods to the buyer in exchange for the
  
  price, and the buyer shall be ready and willing to pay the price in exchange
  
  for possession of the goods.