book Maths Puzzle Numerical Ability

A price increased from $78 to $104. What is the percent of increase?
My answer was 20.28%
Thanks

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book Other Question

(X^2+6)2/3=16 The cruise-line boat travels 8 miles upstream and 8 miles downstream. The total time for both parts of the trip is 3 hours. The speed of the stream is 2 mph. How fast does the boat