SOLUTION: I got three different answer can someone please put me on the right track
thank you in advance.
Walt made an extra $9000 last year from a part-time job. He invested part o
Algebra.Com
Question 171715This question is from textbook
: I got three different answer can someone please put me on the right track
thank you in advance.
Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%?
This question is from textbook
Found 2 solutions by stanbon, ptaylor:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%?
--------------------------------
Interest Equation: 0.08x + 0.09(9000-x) = 770
8x + 9(9000-x) = 77000
-x +81000 = 77000
x = 4000 (amount invested at 8%)
==================================
Cheers,
Stan H.
Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
Interest(I)=Principal(P)*Rate(R)*Time(T)
Let x=amount invested at 8%
Then 9000-x=amount invested at 9%
Interest at 8%=x*0.08*1=0.08x
Interest at 9%=(9000-x)*0.09*1=0.09(9000-x)
And we are told that the above interest adds up to 770, so:
0.08x+0.09(9000-x)=770 get rid of parens
0.08x+810-0.09x=770 subtract 810 from each side
0.08x+810-810-0.09x=770-810 collect like terms
-0.01x=-40 divide each side by-0.01
x=$4000--------------------amount invested at 8%
9000-x=9000-4000=$5000---------amount invested at 9%
CK
0.08*4000+0.09*5000=770
320+450=770
770=770
Hope this helps---ptaylor
RELATED QUESTIONS
Hi,
How would I solve the following: Applications of Linear Equations
Walt made an (answered by Earlsdon)
Can somebody help me please? I can't figure this out.
3. Walt made an extra $9000 last (answered by nerdybill)
Walt made an extra $9000 last year from a part-time job. He invested part of the money... (answered by checkley77)
I do not understand how to set this problem up.Please help.Also, how can I check my... (answered by Earlsdon,Alan3354)
Can someone put me on the right track I came up with 3 solution and I don't think my... (answered by Alan3354)
Hello I have tried to solve this using the 2x2x2 method. I don't believe I'm on the right (answered by stanbon)
Can someone please put me on the right track i ask this question four time and no answer... (answered by richwmiller,dylantc77)
I have been working on this math problem and I got an answer, but I am not sure if it is... (answered by stanbon,solver91311)
Here is the problem:
Walt made an extra $12,000 last year from a part-time job. He... (answered by Mathtut)