Exam Maths Puzzle Percentage

If my sales were at 100,000 last year and 400,000 this year what was the percentage increase?

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Exam Other Question

How would I do 2y^2 = 3y + 4 using the Quadratic formula and also how would I do x^2 = 4x using the quadratic formula? Solve linear equation
2c - d = -1 (i)
c + 3d = 17 (ii)