The children's store sells toys at a discount. The original price of buying a small bicycle is 450 yuan, and now it is sold at a 10% discount. How much is it cheaper to buy a small bicycle now than before?
儿童商店优惠出售玩具，买一辆小自行车原价是450元，现在按九折出售．现在买一辆小自行车比原来便宜多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">450 * (9/10)</gadget>
<output>405</output>

<gadget id="calculator">450 - 405</gadget>
<output>45</output>

<result>45</result>