Question 1109514
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In the other tutor's answer, he starts with $2000 as the amount invested in each CD.  In fact the conditions of the problem lead to the fact that the amount is $2000... but you can't start with that fact to solve the problem.<br>
The additional $80 interest is because of the 4% higher interest rate. That means the amount invested is $80/.04 = $2000.<br>
Then, since $2000 is invested in each CD, interest of $120 means an interest rate of 120/2000 = .06 = 6%; and interest of $200 means an interest rate of 200/2000 = .10 = 10%.<br>
So the two interest rates are 6% and 10%.