Selling price=620(1-0.30)(1-0.15)(1-0.05)
selling price = 620(.7)(.85)(.95) = 350.46
Yes, because a unit price is what you pay for one of many things. A unit rate, if you will.
Hey!
First change all the fractions so that they have a common denominator: 40



Now order them:

Good luck and hope this helps! :)