Post office charges for mailing letters: 1.2 yuan for every 20 grams (less than 20 grams, calculated as 20 grams) of less than 100 grams sent to other cities, and an additional 100 grams for the part over 100 grams (less than 100 grams, calculated as 100 grams) 2 yuan. Teacher Li's daughter is studying abroad, and he sent a 202-gram letter. How much should he pay?
邮局邮寄信函的收费规定：寄往外埠100克以内的每20克(不足20克，按20克计算)1.2元，100克以上部分每增加100克(不足100克，按100克计算)加收2元．李老师的女儿在外埠读书，他寄了一封202克的信函，应付多少元钱？
<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">5 * 1.2</gadget>
<output>6</output>

<gadget id="calculator">6 + 2 + 2</gadget>
<output>10</output>

<result>10</result>