The advertising department made a public service advertisement with the same size as the side trapezoid of the handrail on a trapezoidal surface with an upper base of 16 meters, a lower base of 14.2 meters, and a height of 1.2 meters. 45 yuan to pay advertising fees. How much did you pay for this public service advertisement?
广告部在人行天桥扶手栏侧面的一块上底是16米，下底是14.2米，高是1.2米的梯形面上，做了一块与扶手栏侧面梯形同样大的公益广告，如果按每平方米45元付广告费．这块公益广告付了多少元？
<gadget id="calculator">16 + 14.2</gadget>
<output>30.2</output>

<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">30.2 * 0.6 * 45</gadget>
<output>815.4</output>

<result>815.4</result>