Mr. Zhang bought a composition guidance book for each of the 38 students in his class, and spent a total of 722 yuan. Teacher Zhao also wants to buy one such composition guidance book for each of the 43 students in her class. How much does Teacher Zhao need to prepare at least?
张老师为自己班的38名学生每人买了一本作文辅导书，一共花了722元．赵老师也想为自己班的43名学生每人买一本这样的作文辅导书，赵老师至少需要准备多少元？
<gadget id="calculator">722 / 38</gadget>
<output>19</output>

<gadget id="calculator">19 * 43</gadget>
<output>817</output>

<result>817</result>