Q:

The length, breadth and height of a room are in the ratio 7:3:1. If the breadth and height are doubled while the length is halved, then by what percent the total area of the 4 walls of the room will be increased?

• 1
  85%
• 2
  90%
• 3
  75%
• 4
  80%
• 5
  Cannot be determined