A hairdryer marked at ₹400 is sold with a 25% discount and 15% sales tax. Find the selling price.

Discount = $\frac{\mathrm{Discount}\mathrm{\%}}{100}\times \mathrm{Marked} \mathrm{Price}$

Discount = $\frac{25}{100}\times 400$

= ₹100

Selling Price (without sales tax) = Original price - Discount

Selling Price = 400 - 100 = ₹300

Sales tax = 15% of 300

= $\frac{15}{100}\times 300$

= ₹45

Selling Price (with sales tax) = 300 + 45 = ₹345