Dongmen Primary School saved 129 kWh of electricity in August and 263 kWh of electricity in September, calculated at 0.617 yuan per kWh. How much did you save on electricity bills in the past two months?
东门小学八月份节约用电129度，九月份节约用电263度，每度电按0.617元计算．这两个月共节约电费多少元？
<gadget id="calculator">129 + 263</gadget>
<output>392</output>

<gadget id="calculator">392 * 0.617</gadget>
<output>241.864</output>

<result>241.864</result>