Sally has $40,000 to invest some money at 9% interest and the rest at 11%. if her total annual income from these two investments is $4,300, how much does she invest at

a = amount invested at 9%

b = amount invested at 11%

we know she has a total of $40,000 to invest, so, if she invested "a" amount in one, the other quantity must be the slack left from 40,000 and "a", namely b = 40000 - a.

we also know that the yield or earned interest from both amounts is 4300, thus

8+10

step-by-step explanation:

you multiply 4 by 2 and 5 by 2