Identify and explain the technique of sales promotion in the following cases:-
a. ‘ 40% extra free with a pack of Hakka Noodle’.
b. ‘Scratch a card and get a gold coin’ with the purchase of a new car.
c. A mobile company offers a discount of Rs. 2500 to clear off excess inventory.
d. ‘A company offers a pack of ½ kg of salt with the purchase of 3kg bag of sugar. e. Purchase goods worth Rs. 20000 and get a holiday package of Rs. 15000 free’.