The store newly purchased 10 basketballs and 10 footballs. The price of each basketball is 40 yuan, and the price of each football is 50 yuan. How much do these balls sell for in total?
商店新购进篮球、足球各10个，篮球每个售价40元，足球每个售价50元．这些球一共可以卖多少元？
<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<gadget id="calculator">90 * 10</gadget>
<output>900</output>

<result>900</result>