To promote saving electricity, the power company stipulates the following calculation methods for electricity charges: monthly electricity consumption does not exceed 100 kwh, and the charge is 0.56 yuan per kwh; monthly electricity consumption exceeds 100 kwh, and the excess part is charged at 0.68 yuan per kwh TOLL. Xiaoming's family pays 79.8 yuan for electricity in October. How many kWh does it use?
提倡节约用电，电力公司规定了以下的电费计算方法：每月用电不超过100千瓦时，按每千瓦时0.56元收费；每月用电超过100千瓦时，超过部分按每千瓦时0.68元收费．小明家十月付电费79.8元，用电多少千瓦时？
<gadget id="calculator">100 * 0.56</gadget>
<output>56</output>

<gadget id="calculator">79.8 - 56</gadget>
<output>23.8</output>

<gadget id="calculator">23.8 / 0.68</gadget>
<output>35</output>

<gadget id="calculator">100 + 35</gadget>
<output>135</output>

<result>135</result>