Jack purchased two chairs at a discount of 50%

Jack purchased two chairs at a discount of 50%. Sally purchased a table at a discount of 80%. Jack spent more on his two chairs than Sally did on her table. If Jack had purchased his two chairs at a discount of 60%, he would have spent less than Sally. If z represents the undiscounted price of Sally's table, which of the following could be the average undiscounted price of Jack's two chairs, in terms of z?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #24210