exam Maths Puzzle Numerical Ability

Find the missing value.

Principle= $8200.00, Time= 2.5 years, Simple Interest=$3997.50, Rate=???

Please help

Ellen

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exam Other Question

Dave was to inherit 5x as much as Libby. Libby was to inherit 2/5 as much as Hector. The sum that would be shared was $102,000. How much will they each get? What are the roots of the equation x^2+9=0 I got x=+-3i,can someone explain?