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Computing amounts

Compute the missing amount for each of the following notes:

Principal Annual Interest Rate Time Total Interest
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(a) $10,000 10% 2.5 years ?
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(b) $120,000 ? 9 months $10,800
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(c) ? 10% 90 days $1,000
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(d) $40,000 9% ? $1,200
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Solution Preview

Annual Interest Rate was assumed Compounded monthly!

Principal Annual Interest Rate Time Total Interest ...

$2.19