Out of the total production of iron from hematite, an ore of iron, 20% of the ore gets wasted. Out of the remainingiron, only 25% is pure iron If the pure iron obtained in a year from a mine of hematite was 80000 kg, then the quantity of hematite mined in the year is .........

A

400000 kg

B

500000 kg

C

450000 kg

D

600000 kg