Number 9
3 marks · NormalTwo brands of olive oil are sold in a supermarket:
| Brand | Volume (ml) | Price ($) |
|---|---|---|
| PureOlio | 500 | 6.35 |
| ExtraLife | 900 | 10.53 |
Calculate which brand offers the better value for money. Give your answer to the nearest cent per 100 ml.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
PureOlio: $1.27/100 ml, ExtraLife: $1.17/100 ml; ExtraLife is better value.
Also accept: ExtraLife is better value
Common mistakes: Comparing total price instead of price per unit volume.
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Set up the cost per 100 ml calculation for both brands.
M2 · 1 mark · Correct calculation for both brands to nearest cent. (follow-through)
A1 · 1 mark · Correctly identify and state the better-value brand with supporting calculations. (follow-through)
Worked solution
PureOlio: 6.35 ÷ 500 × 100 = $1.27/100 ml
ExtraLife: 10.53 ÷ 900 × 100 = $1.17/100 ml
ExtraLife is better value.