In a large shopping mall, toys are discounted uniformly. Li Qiang's mother bought a racing car for 45 yuan, but the original price was 75 yuan. How much is the discount for this kind of racing car?
一家大型商场，玩具类商品统一打折．李强的妈妈用45元钱买了一辆赛车，而原价是75元，问这类赛车打了几折？
<result>6</result>