book Maths Puzzle Numerical Ability

Can someone help me with this problem?

How di you write 1/8 as a percent?

Thanks,
Lyn

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book Other Question

I have tried to answer this question until I am more confused than ever. Please help.

3(x-1)+4(2x+1)=11x+1 Find Sn for the arithmetic series in which a1=an=13, n=7.

Thanks