Respuesta :
Answer: $16
Step-by-step explanation: 20 x 0.2 (20%) = 4
20 - 4 = 16
Book will be $16
Step-by-step explanation:
If 20 dollars is the original price and the store offers a 20% sale, then divide 20 by 10 to get 10%, which is 2 dollars.
Double this for 20%, or 4 dollars. The book will be 4 dollars cheaper than the original price of $20, so it will be $16.