Sporting goods stores cut prices to promote some equipment. A piece of equipment with an original price of 138 yuan is now priced at 108 yuan. How much cheaper will the school buy 18 such equipment than before?
体育用品商店降价促销部分器材，一台原价138元的器材现在售价为108元．学校购买18台这样的器材，一共要比原来便宜多少元？
<gadget id="calculator">20 * 18</gadget>
<output>360</output>

<result>360</result>