Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt is before the discount is $12, and the cost of each pair of jeans is $19 before the discount. why are the amounts pani pays in a and b different?

Given:
Shirt = $12
Pants = $19

Shirts = 3 * 12 = 36
Jeans = 2 * 19 = 38

Total cost = 36 + 38 = 74

If Pani has a discount of $3 per shirt and $3 per pair of jeans. 

Shirts : 3 * (12-3) = 3 * 9 = 27
Jeans : 2 * (19-3) = 2 *16 = 32

Total cost w/ discounts = 27 + 32 = 59

If Pani paid $71, she got a discount of $3 from the total amount of $74. The discount given was from the total sales, not the price of each item.

Sign should state "$3 discount from total purchase".