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If N2,500.00 amounted to N3,50.00 in 4 years at simple interest, find the rate at...

Mathematics
WAEC 2012

If N2,500.00 amounted to N3,50.00 in 4 years at simple interest, find the rate at which the interest was charged
  • A. 5%
  • B. 7\(\frac{1}{2}\)%
  • C. 8%
  • D. 10%
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Correct Answer: Option D
Explanation
A = 3,500, P = N2,500

A = P + I

But I = N3,500 - N2,500

I = N1,000

I = \(\frac{PRT}{100}\)

N1,000 = \(\frac{2.500 \times R \times 4}{100}\)

1000 = 100R

R = \(\frac{1000}{100}\)

= 10%

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