Question

640 workers were engaged to construct a fly-over in 4 years. At the end of the first year, 25% workers were retrenched. At the end of Ilnd year, 25% workers were also returned. However, to complete the project in time, the number of workers was increased by 25% at the end of third year. How many workers were working
during the fourth year?​

Answer 1

Answer:

450

Step-by-step explanation:

initial workers : 640

workers after I year = 640 - 25% of 640 = 480

workers after II year = 480 - 25% of 480 = 360

workers after III year = 360 + 25% of 360 = 450

hence....

there are 450 workers in IV year