Final answer:
To find the cost per litre of petrol, convert the volume from gallons to litres and divide the total cost by the volume in litres. The calculation with provided figures does not match any of the options given, indicating a possible error in the question or the options provided.
Step-by-step explanation:
To find the cost of one litre of petrol, we need to first convert gallons to litres and then determine the cost per liter. We know that 1 gallon is approximately 3.79 litres. So, to convert 16.5 gallons to liters, we multiply 16.5 by 3.79, which gives us 62.535 litres. Next, if 16.5 gallons of petrol cost Rs 438.75, and we have converted this to litres, we can find the cost per litre by dividing the total cost by the total litres: Rs 438.75 / 62.535 litres = Rs 7.014 per litre. However, we are provided that 11 gallons equal 50 litres in the question, which suggests that 16.5 gallons is equivalent to 75 litres (16.5 / 11 * 50). Using this conversion, we would take Rs 438.75 / 75 litres = Rs 5.85 per litre. But this is not matching with any of the provided options. Hence, we must use the provided conversion rate, suggesting a possible error in the context. Dividing Rs 438.75 by 75 liters gives us Rs 5.85 per liter, which does not match any of the options. Therefore, there may be a misunderstanding in the question or mistake in the options provided.