Question

selling price of an air cooler is Rs 3540 including GST of 18%.find the price of air cooler before GST was added.

Answer 1

(1+18/100)x=3540
59/50x=3540
x=3000
so the price is 3000

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Answer 2

If the cp of air cooler after GST is 118 then the cp of air cooler before GST is 100
now, the The CP of air cooler before GST is
3540 × 100/118 = 30× 100 = 3000
I hope you will understand....