Help mom do the math, mom wants to buy a disinfection cupboard. The original price is 450 yuan, and now the price has been reduced by 20%. How much will my mother save by buying it now?
帮妈妈算一算，妈妈要买消毒碗柜．原价450元，现在降价20%，现在妈妈要买比原来省多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">450 * (1/5)</gadget>
<output>90</output>

<result>90</result>