The price (per litre) of petrol increases by 60%. By what percent should its consumption be reduced such that the expenditure on it increases by 12% only?

The price (per litre) of petrol increases by 60%. By what percent should its consumption be reduced such that the expenditure on it increases by 12% only?
पेट्रोल के मूल्य में (प्रति लीटर ) 60% की वृद्धि होती है। इसकी खपत में कितनें प्रतिशत की कमी कर दी जाए कि इस पर होने वाले व्यय में केवल 12% की वृद्धि हो?

70% 66% 30% 36%