A  sum of money is lent out at simple interest doubles itself in 8 years. Find rate and in how many years will the sum become triple at same rate.

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• 1 Probability
• 2 Playing With Numbers
• 3 Data Handling
• 4 Algebraic Expressions
• 5 Factorisation
• 6 Introduction to Graphs
• 7 Linear Inequations
• 8 Linear Equations
• 9 Circle
• 10 Rational Numbers
• 11 Sets
• 12 Squares and Square Roots
• 13 Cubes and Cube Roots
• 14 Percentage
• 15 Profit, Loss and Discount
• 16 Simple and Compound Interest
• 17 Algebraic Identities
• 18 Exponents
• 19 Construction of Special Types of Quadrilaterals
• 20 Line Symmetry and Reflection
• 21 Area of Rectilinear Figures
• 22 Surface Area and Volume of Solids
• 23 Representing 3-D in 2-D
• 24 Direct and Inverse Variations
• 25 Understanding Shapes