The monthly rate of increase of a fish population in a reservoir is equal to 1.5% of the current population. P P\,P is the population in hundreds and t t\,t is the time in months.
Write down a differential equation for this relationship.
Show that P=Ae0.015tP = Ae^{0.015t}P=Ae0.015t where A A\,A is a constant.
Given that the initial population is 800 fish. Find the population after 2 years (24 months), to the nearest whole number.
438 exam-style questions on OCR A Level Maths 1.8 Integration, covering 1.8.1 Fundamental theorem of calculus (A-level only), 1.8.2 Integrating x^n, 1.8.3 Integrating standard functions (A-level only), 1.8.4 Evaluating definite integrals, 1.8.5 Area between a curve and the x-axis, 1.8.6 Area between two curves, 1.8.7 Integration as the limit of a sum (A-level only), 1.8.8 Integration by substitution (A-level only), 1.8.9 Integration by parts (A-level only), 1.8.10 Use of partial fractions in integration (A-level only), 1.8.11 Differential equations with separable variables (A-level only), 1.8.12 Interpreting the solution of a differential equation (A-level only), and 1.8 Integration. Each one has a worked solution and a mark scheme showing where the marks go.