A store is engaged in a promotional activity. If the purchase is over 50 yuan, 5 yuan will be returned in cash. Mr. Tashi is going to buy 50 notebooks with a unit price of 5 yuan. How much is the cash required?
某商店搞促销活动，购物满50元，返还现金5元，扎西老师准备买单价是5元钱的笔记本50本，需付现金多少元．
<gadget id="calculator">50 * 5</gadget>
<output>250</output>

<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 * (1/10) * 5</gadget>
<output>25</output>

<gadget id="calculator">250 - 25</gadget>
<output>225</output>

<result>225</result>