According to the latest regulations of China Mobile, the long-distance call fee is about 0.8 yuan per minute. After you activate "Long Call Wuyou" (19:00-7:00 every day), the long-distance call fee is only 1/4 of the original one. Xiaoqiang's father's monthly mobile phone bill is about 180 yuan, of which (1/3) is for long-distance calls. How much can Xiaoqiang's father save in mobile phone bills every month after opening the "Worry-free Long Call" service?
按照中国移动的最新规定，长途通话费的标准大约是0.8元/分，开通"长话无忧"(每天19：00-7：00)后，长途通话费只有原来的(1/4)．小强的爸爸每月的手机费大约180元，其中(1/3)是长途通话费，开通"长话无忧"后，小强的爸爸每月可节约手机费多少元？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">180 * (1/3) * (3/4)</gadget>
<output>45</output>

<result>45</result>