In order to use electricity reasonably, a certain city encourages all users to install "peak and valley" electricity meters. The original price of electricity in a city is 0.52 yuan per kilowatt-hour. After the new meter is installed, the electricity consumption is "low" from 9:00 p.m. It is 0.55 yuan. Assume that a user consumes 200 kWh per month, and the power consumption in two different periods is 100 kWh each. Then after refitting the meter, how much can the user save in electricity bills every month?
某市为合理用电，鼓励各用户安装"峰谷"电表．某市原电价为每度0.52元，改装新电表后，每天晚上9时到次日早上8时为用电"低谷"，每度电费为0.30元，其余时间为用电"高峰"，每度电费为0.55元．假定某用户每月用200度电，两个不同时段的耗电量各为100度．那么改装电表后，该用户每月可节约电费多少元？
<gadget id="calculator">0.52 * 200</gadget>
<output>104</output>

<gadget id="calculator">0.55 * 100</gadget>
<output>55</output>

<gadget id="calculator">0.3 * 100</gadget>
<output>30</output>

<gadget id="calculator">55 + 30</gadget>
<output>85</output>

<gadget id="calculator">104 - 85</gadget>
<output>19</output>

<result>19</result>