chair is 150 yuan, and the price of a desk is four times that of a chair. How much does it cost to buy such a set of desks and chairs?
一把椅子150元，一张书桌的价钱是一把椅子的4倍，买这样的一套桌椅要多少元钱？
<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<gadget id="calculator">600 + 150</gadget>
<output>750</output>

<result>750</result>