"Electrician's Handbook" is 80 yuan each, but Xiao Ming's money is only 4/5 of the price of this book. How much money can he buy this book?
《电工手册》每本80元，可是小明的钱只有这本书价钱的(4/5)，他再有多少元钱就能买这本书？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<result>16</result>