AC Lim's answer to Medhha's Primary 5 Maths Rate & Ratio Singapore question.

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AC Lim
Ac Lim's answer
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1st
1 vacuum—->$4
10 vacuum = 10 x $4 = $40
Every 10 vacuum received $20 bonus
Therefore, 10 vacuum received $60 in total.
$60—> 10 vacuum cleaner
$1416 —>?
= 1416/60 x 10
= 23 sets of 10 vacuum cleaner remaining $36
23 x 10 = 230 vacuum cleaner
$36 / $4 = 9 vacuum cleaner
Ans : He sold 230+9= 239 vacuum cleaner altogether.
Hope this helps