In a stationery store, erasers are priced at 50 cents each, ballpoint pens are priced at 1 yuan each, and signature pens are priced at 2 yuan and 50 cents each. Xiao Ming wants to spend 5 yuan and 50 cents to buy two kinds of stationery in the store. How many different choices does he have?
一个文具店中橡皮的售价为每块5角，圆珠笔的售价为每支1元，签字笔的售价为每支2元5角．小明要在该店花5元5角购买其中两种文具，他有多少种不同的选择．
<result>8</result>