Which problem can be solved using the equation shown? 2 dollars and 50 cents x minus 2 dollars = 10 dollars and 50 cents Will bought several books that cost $2. 50 each and received a $2. 00 discount on his total bill. If he paid $10. 50, how many books did he buy? Will bought several books that cost $2. 00 each and received a $2. 00 discount on his total bill. If he paid $10. 50, how many books did he buy? Will bought several books that cost $10. 50 each and received a $2. 00 discount on his total bill. If he paid $2. 50, how many books did he buy? Will bought several books that cost $10. 50 each and received a $2. 50 discount on his total bill. If he paid $2. 50, how many books did he buy?.