Answer:
The original price was [tex]\$10b[/tex]
Step-by-step explanation:
Let
x------> the original price
we know that
[tex]100\%-70\%=30\%=\frac{30}{100}=0.30[/tex]
[tex]0.30x=3b[/tex]
solve for x
Divide by [tex]0.30[/tex] both sides
[tex]x=3b/0.30=\$10b[/tex]
