2 2.1 After a refrigerator was increased in price by $10 \%$ twice consecutively, it was then increased by another $5 \%$. To restore the original price, it must be reduced by at least $x \%$ (where $x$ is an integer). Then $x$ is
(A) 22 .
(B) 23 .
(C) 24 .
(D) 25 .
(3rd "Five Sheep Cup" Junior High School Mathematics Competition, 1991)
[Solution] Let the original price of the refrigerator be 1, then the current price is
$$
(1+10 \%)^{2}(1+5 \%)=1.2705 \text {. }
$$

If a price reduction of $y \%$ can restore it to the original price, then
$$
1.2705 \cdot(1-y \%)=1 \text {, giving } y \approx 21.3 \text {, }
$$

Thus,
$$
x=22 \text {. }
$$

Therefore, the answer is $(A)$.