Correct Answer - Option 1 : 200

**Given:**

Marked Price = Rs. 300

Discount = 15%

pamphlet price = Rs. 15

Profit = 20%

**Formula Used:**

S.P = (100 – discount%)/100 × M.P

C.P = [100/(100 + profit%)] × S.P

**Calculation:**

Marked Price = Rs. 300

∴ Selling Price = {[(85/100) × 300] – 15}

⇒ [(85 × 3) – 15]

⇒ 255 – 15

⇒ Rs. 240

∴ Gain = 20%

∴ C.P = (100/120) × 240

⇒ 100 × 2

⇒ Rs. 200

**∴ The Cost price of each book is Rs. 200.**