Amal borrowed a sum of money with simple interest as per the following rate structure:
(a) 6 p.c. p.a. for the first three years
(b) 8 p.c. p.a. for the next five years
(c) 12 p.c. p.a. for the next eight years
If he paid a total of 5,040 as interest at the end of twelve years, how much money did he borrow?  Choose one:
A) 8,000
B) 10,000
C) 12,000
D) 6,000
E) None of these
Let x be the amount Amal borrowed.   ∴ 18% of x + 40% of x + 48% of x = 5040   or, 106% of x = 5040   ∴ x = 5040⁄106 × 100 = 4754.71   Answer None of these
<result>E</result>
Amal borrowed a sum of money with simple interest as per the following rate structure:
(a) 6 p.c. p.a. for the first three years
(b) 8 p.c. p.a. for the next five years
(c) 12 p.c. p.a. for the next eight years
If he paid a total of 5,040 as interest at the end of twelve years, how much money did he borrow?