Sonia purchase envelopes at the cost of $3.50 each, including tax, and postcards at the cost of $1.25 each, including

Sonia purchase envelopes at the cost of $3.50 each, including tax, and postcards at the cost of $1.25 each, including tax. If Sonia bought the envelopes and the postcards with a $20.00 bill and received a $2.25 change, how many postcards did Sonia buy?


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