Shampoo is sold at two sizes A and B

A contains 800ml and costs $1.30and B contains 1.5 liters and costs $2.30
Which is the better value for money? Show your working clearly

2 answers

Unit price for A : 1.30/800 = ..
Unit price for B : 2.30/1500 = ...

What do you think?
What is the answer?