# algebra investments

posted by .

Peter invested some money at 6% annual interest and martha invested some at 12%. If their investments is \$6000 and their combined interest was \$540. How much money did martha invest?

• algebra investments -

Let Peter's investment be x
then Martha's investment is 6000-x

solve:

.06x + .12(6000-x) = 540
6x + 12x(6000-x) = 54000

I am sure you can finish it.

• algebra investments -

4000

## Similar Questions

Megan has at most \$1500 to invest. She plans to invest some of the money in a long-term CD at 6% and some of it in a short-term CD at 3%. She wants to earn at least \$75 in interest per year. Write a system of inequlites to represent …
2. ### algebra interest word problem

Solve the problem. Roberto invested some money at 7%, and then invested \$2000 more than twice this amount at 11%. His total annual income from the two investments was \$3990. How much was invested at 11%?
3. ### algebra

you invested \$8000, part of it in stock that paid 12% annual interest. however, the rest of the money suffered a 5% loss. if the total annual income from both investments was \$620, how much was invested at each rate?
4. ### Math

Help! Toshiro Hashimoto invested some money at 4.5% simple interest and \$1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was \$801. How much did he invest at each …
5. ### algebra

don williams invested some money st 9% simple interest. At the end of the year, the total amount of his original principal and the interest was \$6.540. How much did he originally invest
6. ### algebra

Glenn invested some money is a certificate of deposit (CD) with an annual yield of 9%. He invested twice as much money in a mutual fund with an annualy yield of 12%. His interest from the two investments at the end of the year was …
7. ### Math

melissa invested a some of money at 3% annual simple inter she invested 3 times that some at 5 % annual simple interest if her total yearly interest from both investments was 7200 how much was invested at 3% ?
8. ### Algebra

I invested \$42,000 in three funds paying 5%, 7%, and 9% simple interest. The total annual interest from these investments was \$2,600. The amount of money invested at 5% was \$200 less than the amount invested at 7% and 9% combined. …
9. ### algebra

mary had 25000 dollars to invest. she invested part of that amount at 3% annual interest and part at 5% annual interest for one year. the amount of interest she earned for both investments was 1100. how much was invested at each rate
10. ### Algebra

A woman invested some money at 8% and some at 9% annual simple interest. The interest for 1 year on the combined investment of \$10,000 was \$860. How much was invested at each rate?

More Similar Questions