topic badge

5.05 Best buys

Worksheet
Best buys
1

A carton of 10 eggs cost \$6.50. Calculate the cost of 1 egg in cents.

2

A 1.35\text{ kg} packet of mince costs \$15. How many grams of mince does each dollar buy?

3

A 0.75\text{ L} bottle of milk costs \$1.05. Calculate the cost of milk per litre.

4

Sally is deciding which of two different cereals she should buy.

  • Chocon Pops costs \$0.84 for 200\text{ g}.

  • Special Q costs \$0.36 for 100\text{ g}.

a

Calculate the cost per kilogram of Choco Pops.

b

Calculate the cost per kilogram of Special Q.

c

Which of the cereal brands is cheaper to buy?

5

A supermarket sells two different brands of eggs, Happy Hens and Sunny Side Up.

  • Happy Hens eggs cost \$6.00 for 12 eggs.

  • Sunny Side Up eggs cost \$1.50 for 5 eggs.

a

Calculate the cost in cents per egg from Happy Hens.

b

Calculate the cost in cents per egg from Sunny Side Up.

c

Which brand sells its eggs at a cheaper price?

6

Consider the following scenarios:

  • At Emporio, durian is sold for 76 cents per kilogram.

  • At Greenery, each 5.5\text{ kg} durian is sold for \$2.97.

a

Calculate the price of 5.5\text{ kg} of durian purchased from Emporio.

b

How much do durians cost per kilogram at Greenery?

c

Which store is the best buy?

7

Iain feels like buying some ice-cream for himself and his friends.

  • A box of 8 Cornettos costs \$18.00.

  • A box of 5 Magnums costs \$7.25.

a

Calculate the cost of a Cornetto.

b

Calculate the cost of a Magnum.

c

Which type of ice-cream is cheaper individually?

8

Isabelle is buying juice for her nephew's birthday party.

  • A 3.2\text{ L} bottle of apple juice costs \$13.76.

  • A 2.1\text{ L} bottle of orange juice costs \$6.30.

a

Calculate the cost per litre of an apple juice.

b

Calculate the cost per litre of an orange juice.

c

Which juice is the best buy?

9

Lisa has never made a potato salad before and wants to try making one. She has to choose between two types of potatoes at the store.

  • A 10.275\text{ kg} sack of sebago potatoes costs \$13.70.

  • A 7.7\text{ kg} sack of russet potatoes costs \$14.00.

a

How many kilograms of sebago potatoes does \$1 buy?

b

How many kilograms of russet potatoes does \$1 buy?

c

Which type of potato is the best buy?

10

Consider the following scenarios:

  • Han paid \$124.62 for 67\text{ L} of petrol in Humbleton.

  • Amelia paid \$82.08 for 57\text{ L} of petrol in Dunkilderry.

a

Calculate the cost per litre of petrol in Humbleton.

b

Calculate the cost per litre of petrol in Dunkilderry.

c

In which suburb is petrol cheaper?

d

Han buys 30\text{ L} in Statesota, and this petrol station matched the best price between Humbleton and Dunkilderry. How much did he pay?

11

Fiona wants to buy some salmon from Whole-sail Seafood.

  • A 1.9\text{ kg} Atlantic salmon costs \$31.35.

  • A 2\text{ kg} Tasmanian salmon costs \$51.00.

a

Calculate the cost per kilogram of Atlantic salmon.

b

Calculate the cost per kilogram of Tasmanian salmon.

c

Which type of salmon is the best buy?

12

Consider the following scenarios:

  • A 200\text{ m}^2 apartment is sold for \$440\,000.

  • An adjacent apartment that is 220\text{ m}^2 in size is sold for \$440\,000.

a

How much per square metre did the first apartment sell for?

b

How much per square metre did the second apartment sell for?

c

Which apartment is the best value per square metre?

13

You want to buy 21 backpacks. Consider the following scenarios:

  • Barry's Bargain Bins sells backpacks for \$5.00 each, and if you buy 5 backpacks the 6th is free.

  • Lucie's Low Price Supplies sells backpacks for \$6.50 each, and if you buy 6 backpacks the 7th is free.

a

How many free backpacks do you get at the following stores?

i

Barry's Bargain Bins

ii

Lucie's Low Price Supplies

b

How much would you spend at the following stores?

i

Barry's Bargain Bins

ii

Lucie's Low Price Supplies

c

In which store would it be cheaper to buy 21 backpacks?

14

Two similar quality clothes dryers both originally cost \$2799.

a

The first clothes dryer is discounted by 11\%. Calculate the new price.

b

The second clothes dryer is discounted by 5\%, and then by a further 6\% after that. Calculate the new price.

c

Which clothes dryer is the best buy?

Sign up to access Worksheet
Get full access to our content with a Mathspace account

Outcomes

VCMNA250

Investigate and calculate 'best buys', with and without digital technologies

What is Mathspace

About Mathspace