A commodity priced at 200 yuan is reduced by 15% and then increased by 15%. What is the price at this time?
一个200元的商品，降价15%后又涨价15%，这时的价钱是多少元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">200 * (17/20) * (23/20)</gadget>
<output>391/2 = around 195.5</output>

<result>391/2 = around 195.5</result>