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If you have $31.25 and you spend $6.99, you would have $31.25 - $6.99 = $24.26 left.
If you then spend $10.00, you would have $24.26 - $10.00 = $14.26 left.
If you also spend $5.00, you would have $14.26 - $5.00 = $9.26 left.