Please show me how to work out the cheapest way to buy the

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I would initially set the profit percentage at the maximum 100%, or £1.12 per candle. This would make the selling price of each candle equal to £2.24. At this profit percentage, the labor rate per hour would come out to £33.60, which appears to be about twice the median income for full-time workers in the UK. This may mean that the profit percentage is too generous. In real life though, a comparison would need to be made with the selling prices of other similar candles. If other similar candles are being sold for £1.75, then the selling price of £2.24 might be unreasonable.

Another reason for selecting the maximum profit percentage is that the seller can always lower the price if sales are lagging, which would effectively lower the profit.