8,000 workers were employed by a company to complete a job in 4 years. At the end of first year,
5% of the workers were retrenched. At the end of
second year, 5% of those working at that time were
retrenched. However to complete the job in time, the
number of workers was increased by 10% of those
working at the end of third year. How many workers
were working during the fourth year?