book Maths Puzzle Numerical Ability

When the Intitail amount under compound interest is 102.5. And the initial amount under simple interest is 100. Both for a period of two years then what is the principal amount ?

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book Other Question

a coin collection contains nickels, dimes, quarters and pennies. the face value of the pennies was $8. there were seven more than three times as many quarters as dimes and sixteen Let x represent the number and then write an expression for the product.

The square of 5 more than a number

Is this correct?

x + 5^2