book Maths Puzzle Numerical Ability

EVelyn paid $89.25, including 5% tax, for her biology textbook. How much did the book itself cost??

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Hi,I hope someone can answer my log question:

log(x+2)-logx= log (x+5) Solve for x.

Thanks alot!
Hello! My name is Lavalle. I am having trouble with multiplying/dividing decimals. Please help me.
5167 x 0.19
2.163 x 0.008
Please Help me, Thank You