Neco Model Questions Vol1 2024 Civic Education Question 15

A study of 10 000 secondary‑school students found that 12 % had tried smoking cigarettes, 8 % had tried inhalant drugs, and 5 % had tried both. After a nationwide anti‑drug campaign, a follow‑up survey showed that the proportion who had tried smoking fell to three‑quarters of its original value, the proportion who had tried inhalants fell by 2 percentage points, and the proportion who had tried both substances fell by 1.5 percentage points. Assuming the reductions are independent and that no new students started using either substance, what is the new overall percentage of students who have tried at least one of the two substances? Also state the absolute reduction in the number of students who have tried at least one substance.