Each set of story books is 105 yuan, and each set of science and technology books is 135 yuan. The school needs to purchase these two new books for the library, 13 sets of each. How much will it cost in total?
故事书每套105元，科技书每套135元，学校要为图书室购买这两种新书，每种13套，一共要花多少钱？
<gadget id="calculator">105 + 135</gadget>
<output>240</output>

<gadget id="calculator">240 * 13</gadget>
<output>3_120</output>

<result>3_120</result>