2. Xiao Wang's hourly wage in the first week is $a$ dollars, working $b$ hours, in the second week the hourly wage increases by $10 \%$, and the total working hours decrease by $10 \%$. Then, compared to the total wage of the first week, the total wage of the second week ( ).
(A) increases by $1 \%$
(B) decreases by $1 \%$
(C) decreases by $1.5 \%$
(D) remains unchanged
2. B.
$$
\begin{array}{l}
\frac{a(1+10\%) b(1-10\%)-a b}{a b} \times 100\% \\
=-1\% .
\end{array}
$$