100% Profit in Bullish Vertical Spreads

Strategy For option Players : - 9 Dec 2008 for rpl has made 100 % profit.
1) Buy (1lot) RPL CA 75@ 4.05 Today close @ 11.95 Profit = 11.95 -4.05 = 7.9
2) Sell ( 1 lot) RPL CA 85@ 1.05 Today closed @ 5.10 Loss = 5.10 - 1.05 = 4.05

If you close both the positions today till 4.15 then net profit made will be
= 7.9 -4.05
= 3.85 * lot size
= 3.85 *1675
= 6448 Rs ( on investment of Rs 5025. )