First find the total distance of the east-west streets: 18 streets * 2 miles/street = <<18*2=36>>36 miles
Then find the total distance of the north-south streets: 10 streets * 4 miles/street = <<10*4=40>>40 miles
Then add the number of miles from each type of street to find the total distance: 36 miles + 40 miles = <<36+40=76>>76 miles
Then multiply that number by 5 to find the number of miles of cable needed: 76 miles street * 5 miles cable/mile street = <<76*5=380>>380 miles of cable
Then multiply that number by the cost of one mile of cable to find the total cost: 380 miles * $2000/mile = $<<380*2000=760000>>760,000
#### 760000