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Hey,
Solution,
Marked price(MP)= $ 80
Discount percent= 20%
Now,
Discount amount=discount percent of MP
                                 = 20% of 80
                                  =20/100*80
                                  = $ 16
Again,
Selling price(SP)=MP - Discount amount
                               =$80 -$16
                               =$64
So,the sale price of the CD player is $ 64.
Hope it helps...
Good luck on your assignment....
Stay safe...
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