Play herb 0.45 yuan each, notebook 1.3 yuan each. How much does it cost to buy 15 copies of each of the two kinds of books?
演草本每本0.45元，笔记本每本1.3元．两种本子各买15本，一共需要多少钱？
<gadget id="calculator">0.45 * 15</gadget>
<output>6.75</output>

<gadget id="calculator">1.3 * 15</gadget>
<output>19.5</output>

<gadget id="calculator">6.75 + 19.5</gadget>
<output>26.25</output>

<result>26.25</result>