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Coopers make nice extract kits, but you won't get real beer by following their instructions. I recommend not using sugar or brew enhancer at all - that stuff is only a cheap way to boost ABV % and will only manage to harm your beer quality. Forget about the cheap method unless you just want cheap beer.
Here is a general rule of ABV % contributions for 20 liter batches:
1.7 kg can of extract - 2.7 % ABV
1.5 kg can of extract - 2.5 % ABV
500 gram bag of dried malt extract - 1 % ABV
For example, I used the above to make a 20 liter batch of hefeweizen that turned out to about 6.3% ABV. The taste and mouthfeel was very good.