Question

rohan sold a calculator to vishal at 20% profit. vishal sold it to naresh at 5% profit . if naresh paid rs 441 for it , what was the coast price of the calculator ?

Answer 1

Let, the cost price of calculator for Rohan = Rs.x

and the cost price of calculator for Naresh= Rs.y

Rohan sold a calculator to Vishal at 20% profit. So,

Cost price for Vishal = (100 + 20) % of x

i.e. 120% of x

And Vishal sold it to naresh at 5% profit.

So, Cost price for Naresh =
(100 + 5) % of (120% of x)

= 105% of 120% of x

And Naresh pays Rs. 441

Therefore,

105% of 120% of x = 441

=> 105/100 × 120/100 × x =441

=> x = 441 × 20 × 5/ 21 × 6

=> x = 350

The cost price of calculator is Rs. 350

Answer 2

Step-by-step explanation:

Suppose that, the cost price of calculator is Rs.100/-

According to the question,

Rohan sold a calculator at 20 % profit,

Selling price = 120

And again vishal sold at 5 % profit , this means

105 = 441

$100\% = \frac{441}{105}\times 100$

100 % = Rs.420 /-

Cost price of calculator for vishal = Rs.420 /-

then,

Cost price of calculator for rohan,

Then,

120 % = 420

$100\% = \frac{420}{120}\times 100$

100 % = Rs.350/-

Cost price of calculator is Rs.350/-