The starting price of a taxi in a certain city is 5 yuan within 3 kilometers, and 1.5 yuan per kilometer thereafter (less than 1 kilometer is counted as 1 kilometer). How much should someone pay to travel 5.1 kilometers in a taxi?
某城市出租车3千米以内起价为5元，以后每千米1.5元，(不足一千米按一千米算)．某人乘出租车行驶5.1千米，需付多少钱？
<gadget id="calculator">3 * 1.5</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 + 5</gadget>
<output>9.5</output>

<result>9.5</result>