Question $9(0\mathrm{.}083333333$ points$)$

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A seasonal index $0\mathrm{.}8$ for March and $1\mathrm{.}1$ for September mean that...

March sales are $20\%$ lower and September sales are $10\%$ higher than the AVERAGE month

March sales account for $80\%$ and September sales for $110\%$ of annual sales

March sales are $20\%$ higher and September sales are $10\%$ lower than the AVERAGE month

March sales are $80\%$ lower and September sales are $110\%$ higher than the AVERAGE month