The school held a winter sports meeting. Zhang Liang drew up a training plan. After one week, his sprint performance improved by 30%. After another week of training, his sprint performance increased by 12%. What percentage?
学校举行冬季体运会，张亮拟定了训练计划，一周后，其短跑成绩提高了30%，再训练一周后，其短跑成绩又提高了12%，两周后的成绩比开始训练时提高了百分之几？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">1 + (3/25)</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">1 * (13/10) * (28/25)</gadget>
<output>182/125 = around 1.456</output>

<gadget id="calculator">(182/125) - 1</gadget>
<output>57/125 = around 0.456</output>

<gadget id="calculator">(57/125) / 1</gadget>
<output>57/125 = around 0.456</output>

<result>57/125 = around 0.456</result>