The population of the Philippines was estimated at 114.9 million in June 2023 and 116.79 million in June 2025.
Write 114.9 million in standard form correct to 3 significant figures.[1]
Its land area is about 300 000 square kilometres and the government aims to keep population density below 350 people per square kilometre. Using the June 2025 population, determine whether this limit has been exceeded.[2]
A bicycle’s material, wage and factory-rent costs are in the ratio 2:3:5. The next year, materials increase by 40%, wages halve, and rent is unchanged. Find the percentage change in total cost.[2]
Jia Min and 11 friends have a set meal costing \($x\) per person before 10% service charge and then 9% GST. She collects $30 from each of her 11 friends and adds $29.70 herself. Find \(x\).[4]
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Answer:(a)(i) \(1.15\times10^8\) (ii) Yes (b) \(7\%\) decrease (c) \(\$25\)