A top is 45 yuan, and the price of a pair of trousers is 60% of a top. How much does it cost to buy a set of such clothes?
一件上衣45元，一条裤子的价钱是一件上衣的60%，购一套这样的衣服要多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">45 * (3/5)</gadget>
<output>27</output>

<gadget id="calculator">27 + 45</gadget>
<output>72</output>

<result>72</result>