baby elephant weighs 100 kilograms at birth, and its weight increases by an average of 200 kilograms per year. How many kilograms will the elephant weigh in 15 years?
小象刚出生时有100千克，体重平均每年增加200千克．15年后这头大象重多少千克？
<gadget id="calculator">200 * 15</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 + 100</gadget>
<output>3_100</output>

<result>3_100</result>