Subject: mathqa
Question: the price of an item is discounted 10 percent on day 1 of a sale . on day 2 , the item is discounted another 20 percent , and on day 3 , it is discounted an additional 40 percent . the price of the item on day 3 is what percentage of the sale price on day 1 ?
Option: 
A: 70 %
B: 48 %
C: 72 %
D: 28 %
Answer: B