He earns 5% of the first 10,000 therefore:
10,000 * 0.05 = $500
And another 3% for those beyond $10,000 (he is left with 50,000 – 10,000 = $40,000)
40,000 * 0.03 = $1,200
Therefore the total commission is:
$500 + $1,200 = $1,700
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