i duno how to do it in tradin a/c
the way i got is =
1. u get sales = 60000
2. put COGS = x
3. hence GP = 60000-x
4. since (GP/COGS) *100 = mark up, ((60000-x)/(x))*100=20
(60000-x)/x=0.2
60000-x=0.2x
60000=1.2x
x=50000
5. since COGS = 50000, n without removing closing stock u get 54700, it means closing stock = 4700, henc u just write closing stock = (4700) n thus get COGS as 50000 n GP as 10000....
if there is a simpler way, plz let me noe