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At first, assuming Devi has 4 unit of money, Ally will have 4 unit + $400

After Ally spent 3/4, left 1/4, therefore remaining will be,

(4 unit + $400) x 1/4 = 1 unit + $100

After Devi spent 1/2, Devi left with,

1/2 x 4 unit = 2 unit

 

2 unit = (1 unit +$100) + $20

1 unit = $120

$120 x 4 = $480

At first, Devi has $480.

 

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