According to the given information, she will have to paint:
[tex]\begin{gathered} 2(10\cdot12)+2(10\cdot9)+(9\cdot12) \\ 240+180+108 \\ 528 \end{gathered}[/tex]
She will have to paint 528 square foot.
If she pays $1.50 per square foot, she will have to pay:
[tex]528\cdot1.50=792[/tex]
She will have to pay $792.
