book Maths Puzzle Numerical Ability

A price decreased from $36 to $27. What is the percent of decrease?
My answer was 3.24% but I dont think that this is the right answer.
Thanks

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book Other Question
cosx+cosy-cos(x+y)=3/2

this is only possible if x=y=60 The sales price of a car is $12,590, which is 20% off the original price. What is the original price?