Book Maths Puzzle Percentage

How would you solve the following:



A bicycle was sold for 30% more than what was originally paid for it. It was sold for $104. How was the bike originally bought for?

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Could you help me out?



f(x)=(x)(x)+5
I am having a hard time with this one, 4-7d=13-4d, could you provide a little help, every answer I come up with does not fit. I come up with d=9/3 everytime, but that does not, fit into the equation. Unless I am doing that step wrong also...Thank you...