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Question

10000 workers were employed to construct a river bridge in four years. At the end of first year 10% workers were retrencehed.At the end of the second year 5% of the workers at that time were retrencehed.However to complete the project in time the number of workers were increased by 10% at the end of the third year.How many workers were working during the fourth year?

Solution
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Initially No of worker =10000
After 1st year 10% worker left
therefore No of worker after 1st year =1000010000×10100=9000
After 2nd year 5% worker left
therefore No of worker after 2nd year =90009000×5100=8550
After 3rd year 10% worker increase
therefore No of worker after 3rd year =8550+8550×10100=9405
So the at the end of 4th year no of worker =9405

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