Math
posted by Z
This task is about choosing a new washing machine.
Your washing machine is broken. You need a new one. The new washing machine must hold at least as much as the old one and spin at least as fast as the old one.
You used your old washing machine three times a week.
Details of your old washing machine : Washes up to 6kg at a time
Spin speed  1200
New washing machines for sale (with 5 year guarantee
Washing Machine
Aqua  £299  5.5kg  1200  unit of electricity for each wash: 0.9
Litres of water used for each wash: 42
Bubble  £399  6kg  1600  1.2  45
Eco  £259  6kg  1000  0.9  44
Optus  £329  7kg  1400  1.3  50
Swirl  £329  6kg  1100  1.1  49
Costs to use a washing machine
Electricity costs  £0.12 per unit
Water costs  £0.003 per litre

Bubble
i don't know pal
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