Peter invested an amount of Rs. 12,000 at the rate of 10% p.a simple interest and another amount at the rate of 20% p.a. simple interest. The total interest earned at the end of one year on the total amount invested became 14% p.a. Find the total amount invested?
Choices:
A) 20,000  B) 72888  C) 27899  D) 27891  E) 27712
Let the second amount be Rs. x. Then,   (12000 * 10 * 1)/100 + (x * 20 * 1)/100 = [(12000 + x) * 14 * 1] / 100   120000 + 20x = 16800 + 14x   x = 8000   Total investment = 12000 + 8000 = Rs. 20,000.   20,000nswer:20,000
<result>A</result>
Peter invested an amount of Rs. 12,000 at the rate of 10% p.a simple interest and another amount at the rate of 20% p.a. simple interest. The total interest earned at the end of one year on the total amount invested became 14% p.a. Find the total amount invested?