$$ Plan A changes retention and maintenance costs for current customers $($B$10)$ to $$20$ and customer retention rate $($B$9)$ to $80\%.$

$$ Plan B $($less aggressive$)$ changes retention and maintenance costs for current customers $($B$10)$ to $$15$ and customer retention rate $($B$9)$ to $70\%.$

$$ Using customer equity as your evaluation tool, would you recommend either strategy be used in place of current practice?