3n+20=170 subtract 20
3n=150 divide by 3
n=50
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10% = 1720% = 2 * 10%20% = 34
20 times $50 equals $1,000. Consecutive serial numbers will only add to the value if they're old bills.
many things 85/100 =17/20 for example so does 170/200 and 340/400
(20/100)170 = 34
70