Succeed with maths – Part 1

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Overall cost

You’re nearly there now – just one more step in the next section to finally work out the DIY cost.

Activity 10 The price of doing it yourself

Timing: Allow approximately 10 minutes

Now work out the DIY cost using all the information you’ve gathered and worked out.

Remember:

• Each roll costs £15.
• There is a ‘three-for-two’ special offer.
• I will also need to buy some safety equipment costing £40.
• I need to buy 20 rolls of insulation.

Answer

Since I need to buy 20 rolls of insulation, I will be able to take advantage of the ‘three-for-two’ offer. So for every three rolls I purchase, I only pay for two rolls.

So cost of three rolls = £15 × 2 = £30

To determine how many times I will get to take advantage of the offer, a picture can be used.

Figure 10 20 rolls of insulation

Since there are six sets of three rolls, it will cost £30 × 6 = £180. Unfortunately, the two additional rolls won’t be on offer, so the insulation will cost £180 + £15 + £15 = £210.

Finally, the safety equipment is £40. This puts the total cost at £210 + £40 = £250

You can now move onto the final step in the problem solving cycle – interpreting the answer

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