Given,
The total cost of a refrigerator including sales tax is ₹$30,940$
The rate of sales tax$12%$
Calculation,
Let, the basic price of refrigerator be $y$
Total price of the refrigerator = ₹$\left[ y+\left( \left( y\times 12 \right)/100 \right) \right]$
$=112y/100$
$112y/100=$ ₹$30,940$ ,
$112y=30,940\times 100$
$112y=30,94,000$
$y=30,94,000/112$
$y=$ ₹$27,625$ $\therefore $The basic price of refrigerator is ₹$27,625$