The school bought 15 sets of tables and chairs, each chair was 21.6 yuan, and each table was 78.4 yuan. How much did the school spend on chairs and tables?
学校买了15套桌椅，每把椅子21.6元，每张桌子78.4元．学校买椅子和桌子共花多少元？
<gadget id="calculator">21.6 + 78.4</gadget>
<output>100</output>

<gadget id="calculator">100 * 15</gadget>
<output>1_500</output>

<result>1_500</result>