MathXL question

Question

Ms. Smith invested ​$36,000 in two​ accounts, one yielding 7​% interest and the other yielding 8​%. If she received a total of​ $2,720 in interest at the end of the​ year, how much did she invest in each​ account?

Answer 1

suppose the interest of A is 7%. The interest of B is 8%

A*7%+B*8%=2720

A+B=36000

you can solve A and B use the equations above.