St 1.
plugging in the numbers.
210 = 1000 {(1+r/100)^2 - 1}
=> .21 = (1+r/100)^2
=> sqrt (.21) = 1 + r/100
=> r = real number
Sufficient to determine whether r>8.
St 2.
(1+r/100) ^ 2 > 1.15
=> (1 + r/100) > sqrt 1.15 or (1 + r/100) < sqrt 1.15
=> r can be having 2 positive values
Insufficient to determine whether r>8.
IMO A
GMAT Prep Q_Interest
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Source: Beat The GMAT — Data Sufficiency |
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jitendragneogi
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