Answer:
The correct answer is €10.00
Step-by-step explanation:
50% of 40 is 20. 50% of 50 is 25, so what you do is just take 20 and multiply that by 0.5 or you can just take 40 and multiply that by 0.25.
I really hope this helps you out!
What do you mean dear sir, what formula?
Is there a picture or diagram that goes along with this. It's kinda confusing for me without the original picture. Sorry