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mean: add 4,7,9,10 and 10.This gives us 40divide 40 by 5, as we have 5 numbers.40/5= 8therefore mean =8
median... if we put all the numbers in an order.. middle number- 9
mode- MOde- MOst common...

16% of £435 is equal to 10% of £435 + 6% of £435.
10% of £435 = 435 = £43.56% of £435 is 6 x 1% of £4351% of £435 = 435/100 = £4.35£4.35 x 6 = £26.1
16% of £435 = £43.5 + £4.35 = £47.85