Task: Question Answering
Input (English): Problem: the price of an item is discounted 10 percent on day 1 of a sale . on day 2 , the item is discounted another 15 percent , and on day 3 , it is discounted an additional 20 percent . the price of the item on day 3 is what percentage of the sale price on day 1 ? 
Options: a ) 28 % , b ) 40 % , c ) 68 % , d ) 70 % , e ) 72 %
Output (English): c