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No. of 20 cent coins = 52.80 / 0.30 = 176

No. of 50 cent coins = 72 / 0.30 = 240

Total value of coins = (176 x 0.20) + (240 x 0.5) = $155.20

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Number of 20-cent coins: $52.80 / ($0.50 – $0.20) = 176.

Number of 50-cent coins: $72/($0.50 – $0.20) = 240.

The total value of his coins: $0.5 * 240 + $0.2 * 176 = $155.20. 

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