Answer:
The Amount invested at 7% interest is $12,855
The Amount invested at 6% interest = $1,102
Step-by-step explanation:
Given as :
The Total money invested = $13,957
Let The money invested at 7% =
= $A
And The money invested at 6% =
= $13957 - $A
Let The interest earn at 7% = 
And The interest earn at 6% = 
-
= $833.73
Let The time period = 1 year
Now,<u> From Simple Interest method</u>
Simple Interest = 
Or,
= 
Or,
= 
And
= 
Or,
= 
∵
-
= $833.73
So,
-
= $833.73
Or, 7 A - 6 (13,957 - A) = $833.73 × 100
Or, 7 A - $83,742 + 6 A = $83373
Or, 13 A = $83373 + $83742
Or, 13 A = $167,115
∴ A = 
i.e A = $12,855
So, The Amount invested at 7% interest = A = $12,855
And The Amount invested at 6% interest = ($13,957 - A) = $13,957 - $12,855
I.e The Amount invested at 6% interest = $1,102
Hence,The Amount invested at 7% interest is $12,855
And The Amount invested at 6% interest = $1,102 . Answer