(25)(i) "Sale" with all its grammatical variations and cognate expressions means every transfer of the property in goods ( other than by way of a mortgage, hypothecation, charge or pledge ) by one person to another in the course of trade or business for cash or for deferred payment or other valuable consideration, and includes -

a) transfer otherwise than in pursuance of a contract of property in any goods for cash, deferred payment or other valuable consideration;

b) transfer of property in goods (whether as goods or in some other form) involved in execution of a works contract;

c) delivery of any goods on hire purchase or any other system of payment by instalments;

d) transfer of the right to use any goods for any purpose (whether or not for a specified period) for cash, deferred payment or other valuable consideration ;

and such transfer, delivery or supply of any goods shall be deemed to be a sale of those goods by the person making the transfer, delivery or supply and purchase of those goods by the person to whom such transfer, delivery or supply is made, but does not include a mortgage, hypothecation, charge or pledge.