https's answer to Rui Er's Primary 6 Maths Percentage Singapore question.

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Https's answer
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$12 ÷ 0.2 ÷ 0.4 = $150 (Ans)



2/5 × 1/5 = 2/25 = 12/150
Ans: $150



20% = 1/5 = 12/60
40% = 2/5 = 60/150
Ans: $150



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2 : 5
2.4 : 6

2.4u - 2u = 0.4u = $12
5u = $12 ÷ 0.4 × 5 = $150 (Ans)