Neco Model Questions Vol1 2022 Geography Question 5

In a tropical region the annual rainfall decreases linearly from north to south. At latitude 5° N the rainfall is 1300 mm and it falls by 80 mm for each degree of latitude moving northwards. The region extends from 5° N to 10° N, so rainfall at 10° N is 900 mm. The mean annual temperature is uniformly 25 °C, which satisfies the temperature requirements for both savanna (20‑30 °C) and woodland (22‑28 °C).\n\nSavanna vegetation occurs where rainfall is between 500 mm and 1000 mm, while woodland occurs where rainfall is between 1000 mm and 1500 mm. Assuming vegetation type follows the rainfall criterion, calculate the percentage of the region's latitudinal extent that would be classified as savanna. Round the answer to the nearest whole percent.