A Mobile is listed at Rs. 280 and the discount offered is 10%. What additional discount must be given to bring the net selling price to Rs. 240?
1
\(4\frac{{16}}{{21}}{\rm{\% }}\)
2
\(5\frac{{16}}{{21}}{\rm{\% }}\)
3
\(3\frac{{16}}{{21}}{\rm{\% }}\)
4
\(4\frac{{17}}{{21}}{\rm{\% }}\)