t = amount at three % , s = amount at seven %
t + s = 30000 ... 3 t + 3 s = 90000
.03 t + .07 s = 1300 ... 3 t + 7 s = 130000
subtracting equations ... 4 s = 40000
find s , then substitute back to find t
Mr. Wilson invested money in two accounts. His total investment was $30,000. If one account pays 3% in interest and the other pays 7% in interest, how much does he have in each account if he earned a total of $1,300 in interest in 1 year?
He invested $ in the 3% account and $in the 7% account.
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