Chapter 2 - Equations, Inequalities, and Problem Solving - 2.4 Applications with Percent - 2.4 Exercise Set - Page 109: 56

$0.8$

Typical percentage problem: What percent ($n$, as a decimal number) of (the base amount $y)$ is $x?$ Translated:$\quad n\cdot y=x$ --- Here, reworded, $\quad 40\%$ of ($y=2$) is ($x=?$). Translated:$\quad 0.4\cdot 2=x$ ($ 40\%$ converted to decimal notation is $0.4)$ $x=0.8$