Q1.
Several people are employed to build a bridge over a river in a period of 4 years. At the end of the first year the number of workers decreased by 5%. This decrease repeats again at the end of the second year. However, to complete the bridge in time, the workforce was increased by 20% at the end of the third year. If the number of people working at the start of the fourth year is 2166, how many people were originally employed?