book Maths Puzzle Numerical Ability

Problem is I=PRT and I need to solve for "r" can anyone help me in describing how I do this?

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book Other Question

dear : i want to solve this limit


limit ( sin x - tan x ) / x^3 at x tandes to 0
I need to multiply this, cant seem to work it out. Please help me


(5√[2] + 3)(√[2] - 2√[3])