. Find the invested part at each rate.

Question

A retired couple invested part of $11,800 at 6% interest and the rest at 7.5%. If their annual income from these investments is $792. Find the invested part at each rate.

Answer 1

a represents the amount invested at 7.5%

11800 - a represents the amount invested at 6%

 

0.075a + 0.06(11800 - a) = 792

 

Can you solve for a and answer?