2. A mall deals in a certain commodity. Due to the current purchase price being $6.4 \%$ lower than the original purchase price, the profit margin has increased by 8 percentage points. Therefore, the current profit margin for dealing in this commodity is ( ).
(A) $23 \%$
(B) $25 \%$
(C) $27 \%$
(D) $29 \%$
2. B.

Let the original purchase price of this product be unit "1". Then the current purchase price is $(1-6.4\%)$. Let the original profit margin for dealing with this product be $x$. Then
$$
(1+x) \times 1=(1+x+8\%)(1-6.4\%) \text{. }
$$

Solving this, we get $1+x=1.17$, which means $x=0.17=17\%$. Therefore, the profit margin for dealing with this product is $25\%$.