<PRE><B>Question 1003724</B>
Molly has Php30000. She invests Php12000 at 15% and the rest at another rate. if her income at the end of the year is Php4860, at what rate did she invest the rest of her money? 
-----
Equations:
interest + interest = interest
0.15*12000 + x*18000 = 4860
Multiply thru by 100 to get::
-------
15*12000 + 1800000x = 486000
---------------------
1800000x = 306000
---
x = 0.17 or 17%
------------
Cheers,
Stan H.
------------</PRE>