Margaret invested her inheritance in two investment firms. At the end of the first year, she had made a
total of $3930 in interest. One firm paid 12% interest for the year and the other paid 15% interest for the
year. Margaret figured that had she interchanged investments, she would have made a total of $4440 in
interest. What was the total amount of Margaret’s inheritance?

Help with setting this up would be greatly appreciated!

Question

Margaret invested her inheritance in two investment firms. At the end of the first year, she had made a 
total of $3930 in interest. One firm paid 12% interest for the year and the other paid 15% interest for the 
year. Margaret figured that had she interchanged investments, she would have made a total of $4440 in 
interest. What was the total amount of Margaret’s inheritance?

Help with setting this up would be greatly appreciated!

anonymous · Answer

Any help?? This is how I have it set up:
.12p + .15b = 3930
.12p + .15b = 4440

However, this can't be solved. I need a push in the right direction!

anonymous · Answer

4 hours later, thanks guys, but I just figured it out.

.15p + .12b = 3930
.12p + .15b = 4440