$\begin {array} {1 1} (A)\;Rs. 8 & \quad (B)\;Rs.8.25 \\ (C)\;Rs. 7.98 & \quad (D)\;None \: of \: these \end {array}$

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Petrol bought in the first year = $ \large\frac{4000}{7.50}$ litres

Petrol bought in the second year = $ \large\frac{4000}{8}$ litres

Petrol bought in third year = $ \large\frac{4000}{8.50}$ litres

Total money = Rs. 12,000

Average cost per litre = $ \large\frac{120000}{\Large\frac{4000}{7.50}+\Large\frac{4000}{8}+\Large\frac{4000}{8.50}}$

$ = 7.98$

Ans : (C)

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