The export volume of a city in 2003 was 7.5 billion yuan, which was 1.5 billion yuan more than that in 2002. What percentage increased?
某市2003年的出口额为75亿元，比2002年多15亿元，增加了百分之几？
<gadget id="calculator">75 - 15</gadget>
<output>60</output>

<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>