fix: formula to calc profit and loss % fix

[gautam-balamurali]

• Formula to calculate profit and loss percentage is not taking quantity into accounts.
• var lossPercentage = (loss / initial) * 100; => var lossPercentage = (loss / (initial * quantity)) * 100;
• var profitPercentage = (profit / initial) * 100; => var profitPercentage = (profit / (initial * quantity)) * 100;

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