If a magazine is subscribed once a month, there is no discount, and each copy costs 16.5 yuan. If you subscribe for a year, you can get a 10% discount. How much will Mr. Wang pay for this magazine for a whole year?
一种杂志如果一月一订，没有优惠，每份需要16.5元，如果订一年可以优惠10%，王老师订了全年的这种杂志，一共要付多少钱？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">16.5 * (9/10) * 12</gadget>
<output>178.2</output>

<result>178.2</result>