exam Maths Puzzle Numerical Ability

What two-digit number is equal to twice the product of its digits?

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Jon buys a new truck for $42700. The car depreciates by 19&1/2% annually. What is the common ratio for the value of the truck in successive years??? I think the 0.805 ????????????? Please can you help me in this question because am having alot of problem...
there it says complete the table of values for y=x-2-4x