Marked price of an item is Rs 300. On purchase of 2 items discount is 24%, on purchase of 5 items discount is 38%. Rachna buys 7 items, what is the effective discount?

Marked price of item = Rs. 300

=> Marked price of 2 items = $$2 \times 300$$ = Rs. 600

Amount saved on buying 2 items = $$\frac{24}{100} \times 600 = Rs. 144$$

Marked price of 5 items = $$5 \times 300$$ = Rs. 1500

Amount saved on buying 5 items = $$\frac{38}{100} \times 1500 = Rs. 570$$

Thus, on buying 7 items, total amount saved = 144 + 570 = Rs. 714

Total marked price of 7 items = $$7 \times 300$$ = Rs. 2100

$$\therefore$$ Effective discount = $$\frac{714}{2100} \times 100$$

= $$\frac{714}{21} = 34 \%$$

=> Ans - (C)