exam Maths Puzzle Numerical Ability

8-[3-2(9-7)-12]-11=

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Jon buys a new truck for $42700. The truck depreciates by 19&1/2 % annually. What is the common ratio for the value of the truck in successive years? I think it may be 0.805 or 0.1 write each fraction as a terminating or repeating decimal 3/8 huh? i really dont get this