Xiaohong's mother goes to the vegetable market to buy vegetables. Celery is 4 yuan per kilogram, and carrots are 0.9 yuan per kilogram. Mom bought 0.8 kilograms of celery and 3 kilograms of carrots. How much did her mother spend on these two vegetables?
小红的妈妈去菜市场买菜，芹菜每千克4元，胡萝卜每千克0.9元，妈妈买了0.8千克芹菜和3千克胡萝卜，妈妈买这两种菜一共花了多少元？
<gadget id="calculator">4 * 0.8</gadget>
<output>3.2</output>

<gadget id="calculator">0.9 * 3</gadget>
<output>2.7</output>

<gadget id="calculator">3.2 + 2.7</gadget>
<output>5.9</output>

<result>5.9</result>