If her total annual interest is $420. Then the amount of invested will be $4200.
The quantity of anything is stated as though it were a fraction of a hundred.
Emma has half of her investments in stock paying a 9% dividend and the other half in a stock paying 11% interest.
If her total annual interest is $420.
Then the amount of invested will be
Let x be the invested amount.
0.09(x/2) + 0.11(x/2) = 420
(x/2) (0.09 + 0.11) = 420
x/2 = 2100
x = $4200
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