Teacher Li bought 5 footballs. The price of footballs is 4 times that of rubber balls. A rubber ball costs 20 yuan. How much did Mr. Wang spend on football?
李老师买了5个足球，足球的售价是橡皮球的4倍，一个橡皮球20元．王老师买足球用了多少钱？
<gadget id="calculator">20 * 4 * 5</gadget>
<output>400</output>

<result>400</result>