Problem: frank the fencemaker needs to fence in a rectangular yard . he fences in the entire yard , except for one full side of the yard , which equals 40 feet . the yard has an area of 480 square feet . how many feet offence does frank use ? 
Options: ['a ) 14', 'b ) 47', 'c ) 54', 'd ) 180', 'e ) 64']
e