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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The number of students in the psychologhy class is 34 fewer than the number of students in world history. The total enrollment for the two classes is 134 students How many stduents are in each class. On a trip Jennifer noticed that her car averaged 21 mi/gal of gas except for the days she used the air conditioning, and then it averaged only 17 mi/gal. If she used 91 gal of gas