batch of clothing was marked with an 80% price increase on the basis of the purchase price. Although the merchants sold them at a discount, they still sold poorly. So the merchant carried out a promotion and implemented a special price, that is, directly increased the price by 20% to sell, but the sales volume only increased by 20%, and the total sales volume remained unchanged. How much discount did the merchant originally offer when selling?
一批服装在进价基础上加价80%后标价，尽管商家打折销售，但还是销售不畅．于是商家进行促销，实行一口特价，即：直接加价20%出售，结果销售量只增加20%，并保持销售总额不变，问商家原来销售时打的折为几折？
<result>8</result>