A certain sum is invested at simple interest at 15% p.a. for two years instead of investing at 12% p.a. for the same time period. Therefore the interest received is more by Rs. 840. Find the sum?
Choose the most appropriate option:
A) Rs. 7000	B) Rs. 9000	C) Rs. 14000	D) Rs. 17000	E) Rs. 27000
Let the sum be Rs. x.   (x * 15 * 2)/100 - (x * 12 * 2)/100 = 840   =&gt; 30x/100 - 24x/100 =840   =&gt; 6x/100 = 840   =&gt; x = 14000.   ANSWER:Rs. 14000
<result>C</result>
A certain sum is invested at simple interest at 15% p.a. for two years instead of investing at 12% p.a. for the same time period. Therefore the interest received is more by Rs. 840. Find the sum?