SOLUTION: Laura had $8000 in her piggy band. She invested some money in Bank A at 9% per annum and the remainder of the money in Bank B at 10% per annum. If she made $740 in interest overall
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Question 1022012: Laura had $8000 in her piggy band. She invested some money in Bank A at 9% per annum and the remainder of the money in Bank B at 10% per annum. If she made $740 in interest overall, how much did she put into each bank? Answer by Herdaysoji(25) (Show Source):
You can put this solution on YOUR website! x amount to bank A, y amount to bank B
but x+y=8000 so
.'.y=8000-x
740=(y10/100)+(x9/100) i meant 10% & 9% of y and x
740=(10y+9x/100)
740=(10(8000-x)+9x/100)
740=(80000-10x+9x/100)
multiply r.h.s with 100
74000=80000-x
74000-80000=-x
-x=-6000
x=6000, y=2000
