0.065s+12000=45000
This is the formula you would use. Where 0.065 is 6.5% in decimal form, s is the value of the homes she must sell, 12000 is her yearly salary and 45000 is the total she wants to earn.
0.065s+12000=45000
-12000 -12000
0.065s=33000
-------- --------
0.065 0.065
s=507,692.31 (rounded to the nearest hundredth)
The total value of the homes she must sell to earn a total of $45000 is $507,692.31