Which one of the following represents the ratio of the volume of helical reinforcement to the volume of the core?
1
\(0.36\left( {\frac{{{A_g}}}{{{A_c}}} - 1} \right)\frac{{{f_{ck}}}}{{{f_y}}}\;\)
2
\(0.36\left( {\frac{{{A_g}}}{{{A_s}}} - 1} \right)\frac{{{f_{ck}}}}{{{f_y}}}\)
3
\(0.36\left( {\frac{{{A_s}}}{{{A_c}}} - 1} \right)\frac{{{f_{ck}}}}{{{f_y}}}\)
4
\(0.36\left( {\frac{{{A_c}}}{{{A_s}}} - 1} \right)\frac{{{f_{ck}}}}{{{f_y}}}\)