Jia Earn Lim's answer to liang liang's Secondary 2 Maths Singapore question.

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Jia Earn Lim
Jia Earn Lim's answer
96 answers (Tutor Details)
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Hope this helps :) I annotated certain steps in red to illustrate the steps I “skipped”. Do note for (bii) even though the new L is 4 times of old value of L, the question is asking for increase (and in %).