As my teacher was explaining this, i didn't have enough time to ask her how we got to $20.00. so how do i get to 20 if the markup is $7.50?

You got the twenty by adding the markup price and the original price.

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.