book Maths Puzzle Numerical Ability

how do u turn a decimal into a percentage?

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book Other Question

What is the value of y^3+y^3 ?
is it 2y^3 or y^6?
I have a problem with applying the order of operations here are some problems that i have tried: 4^3-5(7-[1])
7(3-9)+12/(-4)