A forest consists $of$ two types $of$ trees: those that are $0-5ft$ and those that are taller than $5ft.$

Each year, $40\%of$ all $0-5ft$ tall trees die, $10\%$ are sold for $$20$ each, $30\%$ stay between $0$ and $5$

$ft,$ and $20\%$ grow $tobe$ more than $5ft.$ Each year, $50\%of$ all trees taller than $5ft$ are sold for

$$50,20\%$ are sold for $$30,$ and $30\%$ remain $in$ the forest.