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 much was the bike originally bought for?

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Book Other Question

in a basketball game, a team scored 95 points. they scored 10 more field goals than free throws, and 1 more three-point shot than free throws. if a field goal is worth 2 points a How to sulve quadratic equations using the cmopleting the square method ?
Example: 2x square + 5x +3