exam Maths Puzzle Numerical Ability

If $4000 is invested at 6%, how much must be invested at 3% so that the total annual income will be $270?

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exam Other Question

A certin sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of intrest from both investments is $91. How much is invested at 8%. I am not good at simplifying when it comes to multiplying

Square root of 7 x square root of 14

and
(2x square root 2x)(3 square root 5x)

and
square root of 7 (5 square root 5-3 sqaure root 7)

Thanks a million