Xiao Wang bought a batch of toothbrushes at the wholesale price of 0.35 yuan each, and the retail price of 0.40 yuan per toothbrush. When there were 200 toothbrushes left unsold, Xiao Wang calculated and deducted all costs and had made a profit of 200 yuan. How many store-bought toothbrushes?
小王按批发价买进一批牙刷，每枝0.35元，零售价每枝0.40元，当还剩下200枝没卖时，小王计算扣除所有成本已获利200元．商店买来牙刷多少枝？
<gadget id="calculator">0.4 - 0.35</gadget>
<output>0.05</output>

<gadget id="calculator">200 / 0.05</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 + 200</gadget>
<output>4_200</output>

<result>4_200</result>