Task: Question Answering
Input (English): Problem: the price of an item is discounted 5 percent on day 1 of a sale . on day 2 , the item is discounted another 10 percent , and on day 3 , it is discounted an additional 15 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 ) 64.8 % , d ) 76.5 % , e ) 78 %
Output (English): d