Mathematics 0580 · IGCSE · Exponential growth and decay

Exponential growth and decay — practice question

There are 20 000 bacteria at the beginning of the experiment. Their number rises by 30% each hour.

(a)[2]

Find the bacteria count after 4 hours.

(b)[2]

After how many whole hours from the beginning of the experiment will the bacteria count be greater than one million?

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct expression for compound growth” …