1. If $\frac{a+b}{b}=1.4$, what is $\frac{b-a}{a}$?
1. If $\frac{a+b}{b}=1 \frac{2}{5}$,

then $\frac{a}{b}+\frac{b}{b}=1+\frac{2}{5}$

2 points

i.e., $\frac{a}{b}+1=1+\frac{2}{5}$,

1 point

which means $\frac{a}{b}=\frac{2}{5}$.

So, $\frac{b}{a}=\frac{5}{2}$.

1 point

$\frac{b-a}{a}=\frac{b}{a}-\frac{a}{a}=\frac{b}{a}-1=\frac{5}{2}-1=\frac{3}{2}$.

4 points

TOTAL 10 POINTS