Discussion

Explanation:

Ramya’s car already has 5 litres in the tank.

Her car’s tank capacity is 35 litres.

She can fill a maximum of 30 litres more.

The petrol cost in Rampur is Rs. 45/litre

As the cost of petrol is lower at all the succeeding petrol pumps that come on the way and hence, to minimize the cost, she will fill enough petrol to reach the first pump i.e 150 km.

She already has 5 litres using which she can travel 40 km.

Hence, to travel 110 km, she will need 110/8 = 13.75 litres at the rate of 45 per litre.

On reaching the first petrol pump in the reverse journey, she will fill up enough petrol to reach the second petrol pump as the cost of petrol in the second pump is less than the cost of the first pump.

This distance is 50 km.

Ramya needs 50/8 = 6.25 litres at the rate of Rs. 40/litre.

For the rest of the journey (200 km) she will need 200/8 = 25 litres at the rate of Rs. 35/litre.

Hence the total cost is (13.75 × 45 + 6.25 × 40 + 25 × 35) = 1743.75

Hence, option (d).

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