All books in a bookstore are sold at a 5% discount. Ding Ding bought an extra-curricular book for 19 yuan. How much less did he pay than the original price? (comprehensive column or equation, not calculated) column:
某书店所有书籍打九五折销售，丁丁花了19元钱买了一本课外书，他比原价少花了多少元钱？(综合列式或方程，不计算)列式：
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">19 / (19/20)</gadget>
<output>20</output>

<gadget id="calculator">20 - 19</gadget>
<output>1</output>

<result>1</result>