Problem $5.$ For a typical reinforcing steel bar permitted for use by ACl$318-14/19.$

$($a$)(2$ points$)$ What is generally the Young's modulus of the rebar?

$($b$)(2$ points$)$ What does the 'grade' on a rebar represent?

$($c$)(2$ points$)$ What is nearly the yield strain of a Grade$-80$ steel?

$\frac{6}{7}$