To determine the final price Linh pays, we need to calculate her total purchase before applying the 30% coupon, then apply the discount.

Step 1: Calculate the total price before the discount

Linh buys:

• 2 T-shirts at $12 each: $2 \times 12 = 24$
• 1 pair of shoes for $28
• 1 pair of jeans for $45

The total price before the discount is: $24 + 28 + 45 = 97$

Step 2: Apply the 30% discount

A 30% discount means Linh saves 30% of $97. Let's calculate the discount: $0.30 \times 97 = 29.10$

Step 3: Subtract the discount from the total price

The final price Linh pays is: $97 - 29.10 = 67.90$

Therefore, the final price Linh pays is $67.90.

The correct answer is: $\boxed{67.90}$

Would you like further details or have any questions? Here are five related questions to expand your understanding:

1. What would Linh pay if the discount was 50% instead of 30%?
2. How would tax affect Linh's final price if there was a 7% sales tax?
3. If Linh returned one of the T-shirts, what would be her new total after the discount?
4. What is the percentage discount Linh would need to bring her final price to exactly $50?
5. How much would Linh save if the shoes were on a separate 10% discount?

Tip: When calculating discounts, it's often easier to subtract the percentage from 100% and multiply directly by the original total for quicker results!