The old value of average is $6890
It will lower by 100%
Let us find the amount of lower
[tex]\begin{gathered} L=\frac{100}{100}\times6890 \\ L=6890 \end{gathered}[/tex]Then to find the new amount subtract the lower from the old
[tex]\begin{gathered} N=6890-6890 \\ N=0 \end{gathered}[/tex]The average of this year is $0