exam Maths Puzzle Numerical Ability

question:

(100P-4000)/100P =0.3

solve for P
please show all working
thanks

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exam Other Question

Add. Express your answer in simplest form.

4/s + 7/s^2

I have come up with 4s+7/s^2. Is this correct???? write the equation of the line passing through each of the given pairs of points. Write your results in slope intercept form where possible.
#20 is: (-1,3) and (4,-2)

#24 is: (2,-3) and (2,4)

Thanks!