Given
gas prices are now $3.75 and it up 10% from 6 months ago.
Find out how much were gas prices 6 months ago.
To proof
gas prices now = $3.75
let the gas price 6 month ago = x
gas price now is rise up 10% from 6 months ago
First write 10% in simpler form
[tex]= \frac{10}{100}[/tex]
= 0.1
Now the equation becomes
0.1x + x = 3.75
1.1x = 3.75
[tex]x =\frac{3.75}{1.1}[/tex]
x = 3.41 (approx)
Thus gas prices 6 months ago be $ 3.41 (approx )
Hence proved
