Double money after visit to temple

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One person has some money in his pocket,
He visits four temple on the way.
As soon as he enters a temple, his money gets double
and he offers Rs. 100 in each temple.
Thus he is left with no money after he returns from the fourth temple.
How much money he had initially ?

If you are genius solve it… in 10 minutes.

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Answers is 93.75
Enters Temple 1 = (93.75*2)-100 = 87.5
Enters Temple 2 = (87.5*2)-100 = 75
Enters Temple 3 = (75*2)-100 = 50
Enters Temple 4 = (50*2)-100 = 0
Hence left with no money after Temple 4