exam Maths Puzzle Numerical Ability

Hello, I am trying to create a formula that will create a series of numbers based on knowing only 3 numbers of the series. This is not from a textbook but will be used to create a

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In a two digit number, unit’s digit is 3 more than the ten’s digit. The number formed by interchanging the digits and the original number are in the ratio 7 : 4. Find the number I need help with this question.

How much should be invested at 8% compounded semiannually in order to have $5000 at the end of 8 years.