Bayside Insurance offers two health plans. Under plan A, Giselle would have to pay the first $60 of her medical bills, plus 30% of the rest. Plan B would pay the first $140, but only 20% of the rest. For what amount of medical bills will plan B save Giselle money? Assume she has over $140 in bills.

A= $60 +30x
B= $140 + 20x
then I get confused