Answer
Find out the what is the percentage of this discount .
To prove
Formula
Discount = Marked price - selling price
As given
a jar of natural peanut butter normally costs $4.00 .
it's on sale for $3.60 .
thus
Marked price = $4.00
selling price = $3.60
put in the above formula
Discount = 4.00 - 3.60
= 0.4
Formula
[tex]Discount\ percentage = \frac{Discount\times 100}{Marked\ price}[/tex]
put the value
[tex]Discount\ percentage = \frac{0.4\times 100}{4.00}[/tex]
Discount percentage = 10%
Option (a) is correct .
Hence proved
