LEFT( 30.5-30.4 \RIGHT)+\left( 30.3-30.2 \right)~\] \[+\left( 30.1-30 \right)+\left( 29.9-29.8 \right)+\left( 29.7-29.6 \right)~\] \[+\left( 29.5-29.4 \right)+\left( 29.3-29.2 \right)+\left( 29.1-29.0 \right)~~\] \[=0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1=0.8~~\]