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Bob installed new windows in his house which were advertised to cut his energy bill by 7.1% per month after installation. If his new energy bill was $315, what was his monthly bill before he installed the new windows?

Respuesta :

His monthly bill before he installed the new windows was $339.074...

Explanation

Suppose, his monthly bill before he installed the new windows was  [tex]x[/tex] dollar.

As his energy bill was decreased by 7.1% per month after installation, so the amount of bill decreased [tex]=x*\frac{7.1}{100}=0.071x[/tex] dollar

Given that, his new energy bill was $315. So the equation will be...

[tex]x-0.071x= 315\\ \\ 0.929x=315\\ \\ x=\frac{315}{0.929}=339.074....[/tex]

So, his monthly bill before he installed the new windows was $339.074...



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