exam Maths Puzzle Numerical Ability

The value of a computer depreciates at the rate of 18% per year. If the computer is now worth $1600, find its value 20 months ago. Give your answer to the nearest dollar. What am I supposed to do?

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Could you tell me how to solve the following question: For a particular salmon population, the relationship between the number "S" of spawner and the number "R" of offspring that s I am struggling with this synthetic division problem, the answer I am coming up with is not what the book answer is, help:
5x�-31x+30