Sales$ $167,000$$ $890,000$$ $55,000$$ $274,000$Sales discounts$3,00020,5006005,100$Sales returns and allowances$19,0006,0005,6001,400$Cost of goods sold$96,135542,27838,064130,005$

$($a$)$ Compute net sales, gross profit, and the gross margin ratio for each of the four separate companies.

$($b$)$ Which company has the better gross margin ratio?