Discount = Amount of Bill × \(\frac{Rate}{100}\times\frac{Unexpired\,days}{365}\)
(i) Discount = 30,000 × \(\frac{12}{100}\times\frac{3}{12}\) = ₹ 900
(ii) Discount = 30,000 × \(\frac{12}{100}\times\frac{2}{12}\) = ₹ 600
(iii) Discount = 30,000 × \(\frac{12}{100}\times\frac{1}{12}\) = ₹ 300