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First to get 10% of $64 you need to divide by ten. So.. $64 / 10 = $6.40 To make that 20% you then need to multiply by 2. So.. $6.40 x 2 = $12.80 So to work out the sale price you need to subtract the 20% from the original sum of $64. $64 - $12.80 = $51.20 Glad to help :)
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Make a the subject of w=3(2a+b)-4
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