Answer:
B. 0.05(0.4x)
Step-by-step explanation:
original price: x dollars
final price: 1.05(x-0.6x)
In the final price, (x - 0.6x) represents the discount of 60% on the shirt.
After that sales tax was applied which was 1.05 ≈ 105%. So, sales tax: 5%
To find the sales tax amount:
5% × (x - 0.6x)
5% × (0.4x)
0.05(0.4x)
Hence, 0.05(0.4x) is the amount of sales tax applied on the shirt.