When running a three wire level loop, your backsight readings are

Top $=5\mathrm{.}25$

Middle $=5\mathrm{.}00$

Bottom $=4\mathrm{.}75$

Your foresight readings are

Top $=7\mathrm{.}15$

Middle $=7\mathrm{.}00$

Bottom $=6\mathrm{.}85$

If your stadia factor is $100$ for the level. What is the percent grade from the backsight to the foresight?

$-5\mathrm{.}2\%$

$-2\mathrm{.}5\%$

$5\mathrm{.}2\%$

$2\mathrm{.}5\%$