It is 340 dollars in total, I do this in an ubcenventional way of dividing 272 by 80 which gave you 3.4 which is equal to one percent and then multiply that by 20 which is 68 and add that to the other 80 percent of her bill to get 340 dollars
IF BREADTH=b meters THEN LENGTH=4 meter less than 3 times than the breadth of the hall. LENGTH=3b-4 meters the length of the rectangular hall is=3b-4 meters
