Marked price of an item is Rs 900. On purchase of 2 items discount is 6%, on purchase of 3 items discount is 12%. Rajani buys 5 items, what is the effective discount?

Marked price of item = Rs. 900

=> Marked price of 2 items = $$2 \times 900$$ = Rs. 1800

Amount saved on buying 2 items = $$\frac{6}{100} \times 1800 = Rs. 108$$

Marked price of 3 items = $$3 \times 900$$ = Rs. 2700

Amount saved on buying 3 items = $$\frac{12}{100} \times 2700 = Rs. 324$$

Thus, on buying 5 items, total amount saved = 108 + 324 = Rs. 432

Total marked price of 5 items = $$5 \times 900$$ = Rs. 4500

$$\therefore$$ Effective discount = $$\frac{432}{4500} \times 100$$

= $$\frac{432}{45} = 9.6 \%$$

=> Ans - (B)