Sales of hot dogs at the corner of $24$th and Lex. follow the following patterns: $40\%$ of the days, $80$ are sold; $50\%$ of the days, $90$ are sold; and the remaining days,$100$ are sold. Given the vendor plans to stock $90$ each day, What approx. expected CSL is the vendor targeting?

$82\%$

$60\%$

$90\%$

$70\%$