A hotel wants to cover an 8.2 m by 9.4 m rectangular courtyard with synthetic grass. The manager estimates the area by rounding each measurement to the nearest metre. a Find the manager's estimate of the area. b The synthetic grass costs $85 per square metre. Find the cost of the grass. Find the actual area of the rectangle. d Calculate the percentage error in the manager's estimate. e Will the hotel have enough grass to cover the courtyard? f Find the cost of the grass if the manager had rounded each measurement up to the next metre