In 2016, Weihai City began to implement a tiered price for electricity tariffs: 0.547 yuan/kWh per household for 210 kWh or less per month; 0.597 yuan/kWh for each household between 210-400 kWh per month. Mr. Wang’s house uses 90 kWh of electricity in September. How much will Mr. Wang’s family pay for electricity in September?
2016年威海市电费开始实行阶梯价格：每户每月210度及以下，按0.547元/度收费；每户每月210-400度之间，按0.597元/度．王老师家9月份用电90千瓦时，王老师家9月份要交多少元电费．
<gadget id="calculator">0.547 * 90</gadget>
<output>49.23</output>

<result>49.23</result>