Do I still get full marks for question 4b ??

Sir, in question 4. I have made a stupid mistake.

In 4a, I found the variable cost of $18/unit (it is false, the correct one is $21/unit)

And when I continue to do 4b (which is to calculate the price of profit maximisation and the profit itself), I input the MC / Variable cost of $18 (my wrong answer), so the end results of my profit maximisation price and the profit are wrong as well. However, the formula and the method that I used to find this price and profit are correct.

Now my question, do I still get full marks for 4b ?? (my end results are wrong, because in 4a, I have already wrong, but the formula and the method are correct)