A shirt is now priced at 135 yuan, which is 15 yuan cheaper than before. How much is the reduction?
一件衬衫现售价135元，比原来便宜了15元，降低了百分之几？
<gadget id="calculator">135 + 15</gadget>
<output>150</output>

<gadget id="calculator">15 / 150</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/10) * 1</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>