I am stuck on this question , I don't understand it .

Question

A sporting goods store manager was selling a ski set for a certain price. The manager offered the markdowns​ shown, making the​ one-day sale price of the ski set ​$321. Find the original selling price of the ski set.

( original ski set 20% , the markdown ski set is 30%

Answer 1

321=(1-.30)P=.7P

P=321/.7= $ 458.57= presale price if the discount is 30%

with 20% sale markdown

P=321/(1-.20)= 321/.8= $401.25

20% of 401.25= 401.25/5= 80.25

321+80.25= 401.25