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P naira invested for 4 years invested for 4 yea... - WAEC Mathematics 2008 Question

P naira invested for 4 years invested for 4 years at r% simple interest per annum yields 0.36 p naira interest. Find the value of r
A
1\(\frac{1}{9}\)
B
1\(\frac{4}{9}\)
C
9
D
11
correct option: c

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

where r = r% p.a; I = 0.36p

0.36p = (\frac{P \times r \times 4}{100})

(\frac{0.36 \times 100}{4}) = r

r = 9

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