Xiaodong bought 10 homework books at 0.75 yuan each, and 8 English books at 0.80 yuan each. How much did Xiaodong spend in total?
小东买10本作业本，每本0.75元，又买8本英文本，每本0.80元．小东一共花了多少元？
<gadget id="calculator">0.75 * 10</gadget>
<output>7.5</output>

<gadget id="calculator">0.8 * 8</gadget>
<output>6.4</output>

<gadget id="calculator">7.5 + 6.4</gadget>
<output>13.9</output>

<result>13.9</result>