A car uses 1 liter of petrol to travel 17 miles. After a tune-up, the car travels 17% farther on one liters. How many liters ( best approximation ) of petrol will it take for the car to travel 170 miles after a tune-up ?

A 8.1
B 7.9
C 9.3
D 9.1

Correct Answer: 8.1

After tune - up, the car travels (117% of 17 miles ≈ 20 miles) in one litre petrol. Therefore, petrol required for 170 miles = 170/20 = 8.5 litre.
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