The price of an electronic watch is 90 yuan, which is 30 yuan lower than the original price. How much is it lower than the original price?
一个电子表售价90元，比原来降低了30元，比原来降低了多少
<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>