Given:
The amount for fixed expenses = $1,128.
Semimonthly income = $3,153
We know that a semimonthly payroll is paid twice a month.
![\text{Monthly income =2}*$3,153$=6306](https://img.qammunity.org/2023/formulas/mathematics/college/qpuxhc0akgu6d25g5o3irl7ob8mu65s5w8.png)
The percent of the monthly income is fixed expenses.
Let x be the required percentage.
![x\text{ \% 6306=1128}](https://img.qammunity.org/2023/formulas/mathematics/college/kapsmi0lob1v1iud1ttwtjezd2czg66yk7.png)
![x=(1128)/(6306)*100](https://img.qammunity.org/2023/formulas/mathematics/college/nxc5lce8nrkufenlyxumv0kbpx176pkovt.png)
![x=17.88](https://img.qammunity.org/2023/formulas/mathematics/college/jxkxcjsolukf734g6rgzo8uhs92jnm5hd7.png)
Round off.
![x=18\text{ \%}](https://img.qammunity.org/2023/formulas/mathematics/college/2fl7o6hqbe43cbp2rrxe5ooagq9db13f1n.png)
Hence the required percentage is 18.