Xiao Ming bought a fountain pen and a ballpoint pen. The unit price of the pen is 10.55 yuan, and the unit price of the ballpoint pen is 2.78 yuan. How much did Xiao Ming spend in total?
小明买了一支钢笔和一支圆珠笔，钢笔的单价是10.55元，圆珠笔的单价是2.78元，小明一共花了多少元？
<gadget id="calculator">10.55 + 2.78</gadget>
<output>13.33</output>

<result>13.33</result>