Saint Anthony miracle worker
Let's solve this problem backwards!
If on the last day, after giving the saint $ 10.00 Manoel was left with nothing, that means that day he was only $ 5.00 (because the double of 5 is 10).
The day before (2nd day), before the miracle he had (5 + 10) / 2 = 7.50.
Finally, on the first day before the miracle Manoel had (7.50 + 10) / 2 = 8.75.
ANSWER: On the first day, Manoel had $ 8.75.
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