a sum of money was invested at 8% per annum simple interest. If after 4 years the money amounts to N330.00. Find the amount originally invested

A.
N180.00 
B.
n165.00 
C.
N150.00 
D.
N250.00 
E.
N200.00
Correct Answer: Option D
Explanation
S.I = (frac{PTR}{100})
T = 4yrs, R = 8%, a = N330.00
330 – P = (frac{PTR}{100}), A = P + I
i.e. A = P + (frac{PTR}{100})
330 = P + (frac{P(4) (8)}{100})
33000 = 32P + 100p
132P = 33000
P = N250.00