Li Lin is 12 years old and weighs 56 kilograms, which is an overweight child. She joined a health club and lost an average of 0.8 kilograms per week. Four weeks have passed. How many kilograms does Li Lin weigh now?
李林今年12岁，体重为56千克，属于超重儿童．她加入一个健康俱乐部，平均每个星期体重减轻了0.8千克，四个星期过去了，请问李林现在的体重多少千克？
<gadget id="calculator">0.8 * 4</gadget>
<output>3.2</output>

<gadget id="calculator">56 - 3.2</gadget>
<output>52.8</output>

<result>52.8</result>