The annual rate of increase of an investment's value is proportional to its value, specifically 3.5% of the value. V V\,V is the value in thousands of pounds and t t\,t is the time in years.
Write down a differential equation for this relationship.
Show that V=Ae0.035tV = Ae^{0.035t}V=Ae0.035t where A A\,A is a constant.
Given that the initial value of the investment is £12,000. Find the value after 5 years, giving your answer to the nearest £10.
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.