Explain what this table is describing in layman's terms, and how did they get these numbers and what numbers are missing such as how many units were sold: Table 2 Sales and margin data Hearing Aids Unit Price 2015 Sales Margin Low-end $1,000 $400,000 24% Mid-range $2,500 $1,250,000 46% High-end $4,000 $400,000 60%