Carl has $7$ dollars and $40$ cents. One hammer cost $1.70$ dollars, and one saw is $50$ cents cheaper than one hammer. After buying $3$ hammer and $1$ saw, how much does he have left? 
选项为:A:$1.5.$ dollars  B:$1.3.$ dollars  C:$1.2.$ dollars  D:$1.1.$ dollars  E:$0.8.$ dollars  请回答其中一个选项.