1st day:
[tex]4000 \times 15\% = 600[/tex]
[tex]4000 - 600 = 3400[/tex]
2nd day:
[tex]3400 \times 15\% = 510[/tex]
[tex]3400 - 510 = 2890[/tex]
~~
You answer should be $2890.
~~
I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out!!
~Zoey