An oil refinery takes 100 litres of crude oil as input and after refining for 1 hour gives certain amount of output oil X litres. This can be sold in the market at a profit of Rs 30 per litre. If this oil is further refined for 1/2 hour it gives oil Y litres. This can be sold at a profit of Rs. 50 per litre. Output and input ratio at both the stages is 90%. The maximum amount that can be earned from 1000 litres of crude input is
(a) Rs. 30,000
(b) Rs. 27,000
(c) Rs. 40,000
(d) Rs. 40,500

• Ans is 40500
  first take 100 liters refine it for 1 hour as output it gives 90 liters output
  refine this oil again for half hour as a output it gives 90*90/100=81 literes
  sold this 81 liters at a profit of 50 per liter 81*50=4050
  this process repeates for 10 times as there is 1000 liters
  so toatl profit=10*4050=40500.
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