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

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
RELATED QUESTIONS
Sarah had some money in the piggy bank. On Monday, she took out 2/5 of the money to buy a (answered by math_tutor2020,MathTherapy)

Yuan invested $1200, part at 4.5% per annum and the remainder at 6.5% per annum. After... (answered by ikleyn)

sarah invested $1200 in the bank part at 9% per annum and the remainder at 4% per annum.... (answered by stanbon)

An investor received $1400 interest per annum from a sum of money, with part of it... (answered by edjones)

Susan invested part of her 1800 savings at 9% annum and the remainder at 6% per annum. In (answered by stanbon)

During a certain period, a manufacturing company invested some money in a bank at 40%... (answered by Theo)

Mrs. Goodman invested half of her money at 7% interest in a bank and the other half at 8% (answered by josmiceli)

A person got 100000 dollar when he retired from service. He deposited some of that amount (answered by ikleyn)

amanda has 26 nickels and dimes in her piggy bank. the number of nickels is two fewer... (answered by CubeyThePenguin)