Answer :
Answer:
The person has to invest $5000 at 9% and $7000 at 10%.
Step-by-step explanation:
As stated in the problem, we have an ammount C that the person invest at 9% and an ammount (C+2000) that it is invested at 10%.
To gain $1150 a year, the ammount C needs to satisfy this equation:
[tex]C*0.09+(C+2000)*0.10=1150[/tex]
Applying distributive property,
[tex]0.09C+0.10C+200=1150\\0.19C=1150-200[/tex]
[tex]C=950/0.19\\C=5000[/tex]
So the person has to invest C=$5000 at 9% and (C+2000)=$7000 at 10% to gain $1150 of interest yearly.