Find the combined bulk specific gravity for the following two stockpiles when blended at the percentages shown:

Stockpile # $1(59$ percent, $G_{sb}=2\mathrm{.}710)$

Stockpile # $2(41$ percent, $G_{sb}=2\mathrm{.}673)$

$2\mathrm{.}695$

$2\mathrm{.}683$

$2\mathrm{.}709$

$2\mathrm{.}705$