Anita has a vessel that is full of refined oil. She wants to measure the capacity of the vessel. For this, she takes out 25% of the refined oil from the vessel and then fills the vessel with mustard oil. She repeats the process 4 times and knows that the vessel then contains exactly 10 litres of refined oil. What is the capacity of the vessel?
33 litres
40 litres
2560/81 litres
None of these
2460/81 litres