## Precalculus (6th Edition) Blitzer

$a.\quad 0.36x$ $b.\quad$ No, the computer is selling at $36\%$ of its original price.
$a.$ $(x-0.4x)-0.4(x-0.4x)=(x-0.4x)(1-0.4)$ $=(0.6x)(0.6)$ $=0.36x$ $b.$ Using the result of part a, $0.36=36\%,$ We conclude that the computer is selling at $36\%$ of its original price.