<PRE><B>Question 96951</B>
The formula is   I=prt
So 840 = .06x + .075(12000 - x)
Multiply both sides by 100 to remove decimals
84000 = 6x + 7.5(12000 - x)
84000 = 6x + 90000 - 7.5x
84000 = -1.5x + 90000
-6000 = 1.5x
4000 = x
So to find the second account, go back to 12000 - x = 8000

To check:
6% of 4000 = 240
7.5% of 8000 = 600
which equals original interest of 840</PRE>