CAPE Pure Mathematics Unit 1 · May/June 2015 · Paper 1 · Question Q41

At time t years, the growth of a certain country's gross national product, G, is given by the equation \frac{dG}{dt} = 5 + \cos t. At the beginning of the year 1990, the gross national product was recorded as \$732 million. The estimated gross national product at the beginning of the year 2000 was

1. (A)\int_{732}^{G} dG = \int_{0}^{9} (5 + \cos t)\,dt
2. (B)\int_{732}^{G} dG = \int_{1}^{9} (5 + \cos t)\,dt
3. (C)\int_{732}^{G} dG = \int_{1}^{10} (5 + \cos t)\,dt
4. (D)\int_{732}^{G} dG = \int_{0}^{10} (5 + \cos t)\,dt