book Maths Puzzle Numerical Ability

im so confused.. it says to fill the missing value..
Principal=4000 Start Date=June 16 2005 End Date= ? Interest Rate PA%=7 Interest=$262.36...
Ya im like lost no clue how to sol

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Im not sure what to do.

There are two rectangles. One inside the other. The length of the larger shaded rectangle is 4x+7. The height is 5. The length of the smaller non-shaded Square root of (2x-3) + x = 3