Percentage mark-up = S. P - C.P /C.P x100%
From the question given,
C.P = $1200
S.P = 20 x 100 = $2000
=800 /1200 x100%
= 66.67 %
but you would have to round, so in that case it would be 67%
1.6m questions
2.0m answers