Question

A book seller had 800 copies of a novel. He sold 360 copies for Rs 200 more than their cost. If he gained 20% on the whole by selling the remaining copies for Rs2800 , find the cost of a copy.

Answer 1

Answer:

Cost Price of a copy is Rs. 5

Step-by-step explanation:

Let x be the Cost price of a copy of a novel.

Total cost price of novel = 800x

Selling price of  360 novel = 360x + 200

Total Selling Price of novels = 360x + 200 + 2800 = 360x + 3000

According to the question,

$20=\frac{360x+3000-800x}{800x}\times100$

$20=\frac{360x+3000-800x}{8x}$

$160x=3000-440x$

160x + 440x = 3000

600x = 3000

x = 5

Therefore, Cost Price of a copy is Rs. 5