The experimental primary school needs to buy a composition guidance book for each of the students in the fourth and fifth grades at a price of 14 yuan. It is known that there are 145 students in the fourth grade and 155 students in the fifth grade. How much does it cost for the two grades?
实验小学要为四、五年级的同学每人买一本价格是14元的作文辅导书，已知四年级有145人，五年级有155人，两个年级一共需要多少钱？
<gadget id="calculator">145 + 155</gadget>
<output>300</output>

<gadget id="calculator">300 * 14</gadget>
<output>4_200</output>

<result>4_200</result>