Rs 3600 is divided into two parts such that one part is put out at 3% and the other at 5%. If the annual interest earned from both the investments be Rs 144, find the first part.  Choose one:
A) s 4000
B) s 2800
C) s 1800
D) s 3500
E) s 3100
Explanation :   Average rate = (144/3600)*100= 
<gadget id="calculator">(144/3600)*100</gadget>
<output>4</output>
4   Ratio= 1:1   So, first part = (1/2)*3600= 
<gadget id="calculator">(1/2)*3600</gadget>
<output>1_800</output>
Rs 1800.   Answer : s 1800
<result>C</result>
Rs 3600 is divided into two parts such that one part is put out at 3% and the other at 5%. If the annual interest earned from both the investments be Rs 144, find the first part.