Answer 1

The increase in price of the air-conditioner is only because of increase in amount of sales tax.

Let marked price be x 

And increase in amount of sales tax is 

=(Increase in rate of sales tax) x Price/100 

This amount is given as Rs.1, 920. 

Also it is given 

Increase in rate of sales tax = 6 %

Therefore:

Rs 1,920 = `x xx 6/100`

Rs 1920 = `(6 x)/100`

x = Rs `(1920 xx 100)/6` = Rs 32000

Thus marked price of the air-conditioner is Rs. 32,000