Xiao Ming buys books in an online bookstore. As a member, Xiao Ming can enjoy 20% off the original price of the member price, and because the website is doing promotional activities, he can add a discount of 10 for every 100 bills spent on the basis of the membership price. Finally, compared with the original price, Xiao Ming A total of 195 yuan has been saved, so what is the original price of the book he bought?
小明在网上书店买书，小明是会员，可以享受原价8折的会员价，又赶上网站正在做促销活动，可以在会员价基础上叠加每满100减10的优惠，最后和原价相比，小明一共节省了195元，那么他购买的书原价是多少元．
<gadget id="calculator">100 * 5</gadget>
<output>500</output>

<gadget id="calculator">500 + 80</gadget>
<output>580</output>

<gadget id="calculator">580 / 0.8</gadget>
<output>725</output>

<result>725</result>