Martin bought 10 concert tickets, some at the full price of $2.00 per ticket, and some at a discounted price of $1.60 per ticket. If he spent a total of $18.80, how many discounted tickets did he buy?
Choices:	A) 3	B) 4	C) 5	D) 6	E) 7
Let x be the number of tickets he bought at $2 per ticket.   then 2 x + (10-x)1.6 = 18.8   0.4x = 2.8 =&gt; x = 7   discounted tickets = 10 -x = 3   3ns : 3
<result>A</result>
Martin bought 10 concert tickets, some at the full price of $2.00 per ticket, and some at a discounted price of $1.60 per ticket. If he spent a total of $18.80, how many discounted tickets did he buy?