Question 5163
You are not completely wrong. You copied a wrong value from the question. The amount invested is $2200. You use $2000.
Furthermore, I would suggest that if you express % in decimals you divide by 100.
0.0575(x)+0.045(2200-x)=107.75
0.0575x + 99- 0.045x=107.75 
0.0125x = 8,75
x = 700