If L is total length of a canal in kilometers, P is total perimeter of its lining in meters and C is the cost of lining per square meter, the additional expenditure involved on lining, is
1
1000 PLC
2
\(\frac{{{\rm{PLC}}}}{{1000}}\)
3
\(\frac{{{\rm{PL}}}}{{1000{\rm{C}}}}\)
4
\(\frac{{{\rm{PC}}}}{{100{\rm{L}}}}\)