Sam buys a lamp during the sale. There was a discount of 20%. If the original price is $4, what is the sale price?

Please put in proportion form!
4/100 = x/80
100x = 320
x = 3.20
or
take .2($4) = $ .80
after discount, cost = $ 4.00  .80 = $3.20
To find the sale price, we need to find 80% of the original price.
Let's calculate it step by step:
Step 1: Calculate 80% of the original price.
80% of $4 = 0.8 * $4 = $3.20
So, the sale price of the lamp is $3.20.
To find the sale price, we first need to calculate the discount amount. We can do this by multiplying the original price by the discount percentage.
Discount amount = Original price * Discount percentage
In this case, the original price is $4 and the discount percentage is 20% (or 0.2 in decimal form).
Discount amount = $4 * 0.2 = $0.80
So the discount amount is $0.80.
To find the sale price, we subtract the discount amount from the original price.
Sale price = Original price  Discount amount
Sale price = $4  $0.80 = $3.20
Therefore, the sale price of the lamp is $3.20.
In proportion form, we can write this as:
Original price : Sale price = $4 : $3.20