3.3.13

Compound Interest - After How Many Days?

Test yourself

Compound Interest

In summer, the number of ants in a colony increases by 20% each day. On the first day there are 10,000 ants. How many days until the colony numbers more than 30,000?

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The formula for compound interest

  • N is the number of ants
  • n is the number of days passed
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Answer

  • This is the first day we are over 30 000 so the answer is 7 days.

Jump to other topics

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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