exam Maths Puzzle Numerical Ability

I don't like this kind of problems, it drives me nuts, basically it asks:
If a diagonal of a parallelogram bisects an angle of the parallelogram, the parallelogram is a rhombus. (

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2(b+4)+8b= my work is this correct 2 x b+2 x 4+8b
=2b+8+8b
=18b Draw a time line that shows when the net cash inflows and outflows will occur, and explain how the time line can be used to help sturcture the analysis.

Please show answer as a