Given
List price of electronic washing machine = ₹$24,600$
Rate of sales tax =$15%$
Sales tax = (list price × rate of sale tax) $/100$
$=\left( 24,600\times 15 \right)/100$
= ₹$3,690$
Selling price of watch = ₹ $\left( 24,600+3,690 \right)$
= ₹$28,290$