Let us look at the OHaganBooks.com stock first: You pruchased x shares at $50 each, costing you a total of $50x. Since the stocks apprreaciated by 20%, the profit earned is 20% of the purchase price, or

Similarly, the FarmersBooks.com shares cost you 45y, and appreciated by 10%, or

Finally, the JungleBooks.com shares cost you 30z, and appreciated by 10%, or

Adding all the progits together gives:

10x + 4.5y + 3z = 3,440

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