Xiaolan's family has a private car, which uses No. 93 gasoline. When the oil price is 5.20 yuan/liter, the average monthly fuel cost is 780 yuan. Now that the oil price has increased by 0.30 yuan per liter, how much is the average monthly fuel cost? (assuming other factors remain constant)
小蓝家有一辆私家车，使用的是93号汽油．在油价是5.20元/升时，平均每月的油费是780元．现在油价每升涨了0.30元，平均每月需要油费多少元？(假设其他因素不变)
<gadget id="calculator">5.2 + 0.3</gadget>
<output>5.5</output>

<gadget id="calculator">780 / 5.2</gadget>
<output>150</output>

<gadget id="calculator">5.5 * 150</gadget>
<output>825</output>

<result>825</result>