book Maths Puzzle Numerical Ability

Please help me I need this by Monday, please!! :0)

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?

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Find S(with a sideways 8 beside it) if an=27(1/3)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me. The actual distance between two towns is 28 km. Suppose you measure the distance on your map and find that it is 3.5 cm. What is the scale of your map?