Reduction of 20%. Calculate the sales price of the book. Stephanie wants to buys a book from a sale, the marked price is $20. If the store offers a sales​

$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.

a≈380.13mi² would be your answer if the radius was 11 miles