Peter delivers $$100$$ glasses for a department store. He gets $$$1$$ for delivering a glass safely and pays $$$1$$ if he breaks one. If Peter can make $$$92$$ after delivering all glasses, he broke~\uline{~~~~~~~~~~}~glasses along the way. 
Overseas Competition->Knowledge Point->Word Problem Modules->Chicken-Rabbit Problems->Solving Chicken-Rabbit Problems by Using Hypothesis