Question 1111090
Katy invests a total of $24,000 

 account paying 7% ....x

amount paying 13% ,....24000-x

7%x+13%(24000-x) = 2790

multiply equation by 100
7x+13(24000-x) = 279000

7x+312000-13x=279000
simplify
6x= 33000
x=5500 ... at 7%

24000-5500= 18500 at 13%

CHECK

18500*13% +5500*7% =2790