CAIE IGCSE Mathematics Extended E1.17.1 Use Exponential Growth and Decay Questions

Work through Extended CAIE IGCSE Mathematics exponential models by applying compound multipliers and solving for unknown rates or periods.

Exam points

model exponential growth and decay using repeated percentage multipliers
calculate future or past values with a compound growth or decay factor
solve for a rate or number of periods and round the resulting population or value

[Maximum number: 3]

The average attendance increased exponentially by 4% each year for the three years from 2016 to 2019.
In 2019 the average attendance was 1631.
Find the average attendance for 2016.

1450 or 1449 to 1450
M2 for $1631=k\left(1+\frac4{100}\right)^3$ oe
or B1 for $\left(1+\frac4{100}\right)^3$ oe seen
or M1 for $1631=k\left(1+\frac4{100}\right)^n, n>0$ oe

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CAIE IGCSE Mathematics Extended E1.17.1 Use Exponential Growth and Decay Questions question 1