The cost of living index number in year $2015$ and $2018$ were $97.5$ and $115$ respectively. The salary of a worker in $2015$ was $195000$. How much additional salary was required for him in $2018$ to maintain the same standard of living as in $2015$?
Options
A$3000$
B$4000$
C$3500$
D$4500$
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