The life expectancy of a circulating coin is 30 years. The life expectancy of a circulating dollar bill is only
1 answer:
Life expectancy of dollar bill = d
life expectancy of coin = c
d = 1/20 c
substitute value in for c (30)
d = 1/20 * 30
d = 30/20
d = 1.5
life expectancy of a dollar bill = 1.5 years
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