Question 195050
Breakeven  is  500,,,,base
.
sells at  450 units  which  is  (500-450) =50 shy
.
50 /500 = 1/10=.10 = 10 %,,,,profit
.
checking  ,,,   (.9 ) *500 =450,,,  10 % profit  ,,( 1-.9 = .10=10% )