Correct Answer - B
`2piR_(1)=528`
`implies 2xx22/7xxR_(1)=528`
`impliesR_(1)=84cm`
`implies` New Radius `R_(1)-14=R_(2)`
`implies R_(2)=84-14`
`impliesR_(2)=70`
Area of Road `=pi(R_(1)^(2)-R_(2)^(2))`
`implies=pixx14(154)`
`implies` कुल खर्च
`=22/7xx14xx154xx10=Rs. 67760`