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Answer

At first —
20 cents coins : $1 coins : total
4 units : 1 units : 5 units

After (1 add another 8 $1 coins,) —
20 cents coins : $1 coins : total
2 : 1 : 3
4 units : 2 units: 6 units

2 units – 1 unit = 1 unit = 8
4 x 8 x 0.20 + 1 x 8 x 1 = 14.40

Ans : $14.40.

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