exam Maths Puzzle Numerical Ability

Please help me!The problem is:
An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?
Please and Thank you=)

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exam Other Question
Let x = log(10,2) and y = log(10,3) Then find the coefficients a and b which satisfy log(10,3888)=a x +b y.

I am lost. The volume of a solid bar is equal to the product of the cross-sectional area and the length of the bar.