The answer is $240
When taking off a discount from a sale price, you will need to multiply the the two numbers to get the discount in dollars.
In this case,
$300 x .20 = $60
After you get the discount in dollars, you will need to subtract the discount from the original price of the bicycle to get your new sale price.
$300 - $60 = $240
The bicycle will be $240 when bought with a 20% discount.
Hope this makes sense..!