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Every stack in diagram 1:
10-cents coin -> $0.60
20-cents coin -> $1
Total: $1.60

How many stack in diagram 2:
$88 / $1.60 = 55 stacks

(a)
Each stack of 10-cents coin have 6 coins
Therefore, there are 6 coins x 55 stacks = 330 10-cents coin

(b)
Each stack is $1.
There are 55 stacks.
Therefore, total there are $1 x 55 stacks = $55

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