Answer: Lydia paid the amount of 33.60 dollar
Explanation:
Retail price of shirt = 40 dollar
Discount = 20%
Discount value:
=20% of 40 dollar [ 20/100 * 40 ⇒ 1/5 * 40 ⇒ 40/5 = 8 ]
= 8 dollar [ discount value]
Price of shirt after discount :
= 40 - 8
= 32 dollar
As she paid 5% discount on the discounted price ( 32 dollar )
So, 5% of 32 = 1.6 dollar [ 5/ 100 * 32 ⇒ 1/20 * 32 ⇒ 32/20 = 1.6]
Amount to pay = 32( price after discount) + 1.6 ( Tax)
= 33.60 dollar