Answer:
5 chocolate bars cost 3.15 (i don't have that currency symbol on my keyboard)
Explanation:
First, let's find out what one costs, so it'll be easier.
3.80/6=0.63
Multiply the amount for one chocolate bar by five:
0.63*5=3.15
And there you go! 5 bars cost 3.15
I hope this helped!