An online store has the following advertisement on there homepage.
“FREE Standard Shipping when you spend $75 or more!”
You have already spent $24 shopping online for clothes.
To determine how much more you need to spend in order to qualify for free standard shipping, you can subtract the amount you have already spent from the minimum spending requirement mentioned in the advertisement.
In this case, you have spent $24, and the advertisement specifies that you need to spend $75 or more to qualify for free standard shipping. Therefore, to calculate how much more you need to spend, you can subtract $24 from $75:
$75 - $24 = $51
So, you need to spend an additional $51 in order to qualify for free standard shipping.