Citizen CT-666 Operating Instructions Manual page 35

Cost is $2000
Sell is $2800
Margin=?%
Sell is $1850
Margin is 20%
Cost=?
[ON/AC] 0.
COST
2000 [COST] CT 2000.
MARGIN
2800 [SELL] M= 28.57
[ON/AC] 0.
SELL
1850 [SELL] SL 1850
COST
20 [%] [MARGIN] C= 1480.00.