Blob fish's answer to Arianna's Primary 5 Maths Percentage Singapore question.

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Blob fish
Blob Fish's answer
110 answers (A Helpful Person)
1st
GST is 100% (actual cost of goods) + 7% more. The 7% out of the initial amount you have to pay

So the total amount (interest included) will be
$1100 x 107%= $1177


OR,
You can calculate interest first,
$1100 x 7%= $77,
Then add the initial amount to get $1177.