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Once a study was conducted about the impact of inflation on the prices of petrol and diesel. It has been observed during recent survey that the price of diesel increases by 40 paise every year. Apart from that it is been also observed that the price of petrol also increases by 15 paise every year. If in 2016, the price of petrol was Rs. 65.30 and that of diesel was Rs. 53.70, after how many years will diesel cost 40 paise more than the petrol?

Once a study was conducted about the impact of inflation on the prices of petrol and diesel. It has been observed during recent survey that the price of diesel increases by 40 paise every year. Apart from that it is been also observed that the price of petrol also increases by 15 paise every year. If in 2016, the price of petrol was Rs. 65.30 and that of diesel was Rs. 53.70, after how many years will diesel cost 40 paise more than the petrol? Correct Answer 48

Suppose petrol will cost 40 paise more than diesel after Z years.

⇒ (53.70 + 0.40z) – (65.30 + 0.15z) = 0.40

⇒ 0.25z – 11.60 = 0.40

⇒ 0.25z = 0.40 + 11.60

⇒ z = 12/0.25 = 48 yrs

∴ Diesel will cost 40 paise more than Petrol after 48 years

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