4. Two towns, Springfield and Jonesboro, are to be connected by a road. To build the road directly between them would require a bridge over a lake, and the cost of construction in this case would be $100,000 per mile of road. An alternative is to build a road from Springfield to a third town, Carterville, which is 3 miles due east from Springfield, and then southeast from Carterville to Jonesboro, which is another 10 miles. In this case, no bridges are involved, so the cost of construction is only $60,000 per mile. Approximately how much more will the direct route from Springfield to Jonesboro cost? a) $1,000,000 b) $570,000 c) $213,000 d) $450,000 e) $1,150,000 f) $117,000