exam Maths Puzzle Numerical Ability

The amount of ozone in the atmosphere is decreasing by 0.25%annually. If this rate of decrease continues, after how many years will 82.9% of today's ozone remain?

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Thank you for your help.Solving the following by Factoring the equations of x^2-6x-16=0, would (x+2)(x-8)=0 or -8x+2x, and would the same apply to 6x^2+42x=0,6x(x+7). Is x2 the same as x^2. This site has truly been a big help for me. (6/x-5)-(1/3x-15)+(4/5-x) simplify and reduce, I got -5/(3)(-1)(x-5)