SOLUTION: Dr. Beaker invested $3000, part at 8% and the rest at 7 1/2%. The total return for one year was $231. How much was invested at each rate?

Question 160305: Dr. Beaker invested $3000, part at 8% and the rest at 7 1/2%. The total return for one year was $231. How much was invested at each rate?
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!

Let's supposed "x" is invested @ 8% and the rest ---> "$3000-x" is invested @ 7.5% that has a return of $231 in 1 year. Putting into eqn:
, WORKING EQN

, amount invested at 8%.
amount invested at 7.5%
Let's check, go back WORKING EQN:

Thank you,
Jojo
RELATED QUESTIONS
Maaz Munir invested 7000 part at 7% and the other at 11% if his total return for one year (answered by jorel1380)
dr e man invested $10,000, part at 8 1/2% per annum and the rest at 6 3/4% per annum in... (answered by greenestamps)
A total of $12,000 was invested. Part of the money was invested at 4% and the rest... (answered by checkley79)
Sally invested $3000 in two parts. One part was invested at 8% interest and the second... (answered by bucky)
A total of $2000 was invested: part at 8% and the rest at 12% per year. If after one... (answered by macston)
A total of $9000 was invested, part at 6% and the rest at 3% per year. If the annual... (answered by ikleyn)
a total of 11,000 was invested. part of the 11,000 was invested at 4%, and the rest was... (answered by Boreal)
Bob invested $24000. He invested part of it at 8% interest per year and the rest at 10%... (answered by richwmiller,greenestamps)
One year ago Walt invested $12,000. He invested part of the money at 7% and the rest at... (answered by checkley77)