exam Maths Puzzle Numerical Ability

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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exam Other Question

1. solution of x2y5y-2x-2
2. solution of p0x-1(x-2x0)
3. solution of m5b2mb-2
4. solution of 4x2p0(3xp5-2x-2)

and how you arrive at the solutions thank you how many four-digit numbers starting with 1 and ending with 5 can be written if the digits 1 2 3 4 5 6 7 8 9 are used, including the cases when a digit may appear twice in a given number?