Challenge Response 85

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.