The value of a piece of industrial machinery is decreasing by r% r\%\,r% each year.
The machinery's value will decrease by 45% in 4 years, work out the value of rrr.
Give your answer to 2 decimal places.
Practise Edexcel GCSE Maths Repeated Percentage Change with exam-style questions for Foundation and Higher tier. 56 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.