Question 1015323
If she invest all at 1%, she'd have $1200 interest. 
If she invest all at 2%, she'd have $2400 interest. 

$1800 is right in the middle, i.e. she saw a return of 1.5% so $60,000 at 1% and $60,000 at 2%. 

Equations - 

She invested $X at 1%, and (120000-x) at 2%

.01X + .02(120000)-.02X = 1800

-.01X + 2400 =1800

-.01X = -600

X = 60000  and 120000-60000=60000 as well, so $60000 at 1%, and $60000 at 2%