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A shopkeeper sells a Bulb to Nirmal earns 40% profit on it. Nirmal sells the Bulb to kamlesh at Rs. 630 at a loss of 10%. What is the cost price of the bulb?

A shopkeeper sells a Bulb to Nirmal earns 40% profit on it. Nirmal sells the Bulb to kamlesh at Rs. 630 at a loss of 10%. What is the cost price of the bulb? Correct Answer <span id="docs-internal-guid-1c87b5de-7fff-41fc-4aa5-1a029f6b879c"><span style=" background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; vertical-align: baseline; white-space: pre-wrap;">Rs. 500</span></span>

Given:  

Profit of Shopkeeper = 40%

Selling price of bulb for Nirmal = Rs. 630

Loss of Nirmal = 10%

Formula Used:

Cost price × (100 + Profit %)/100 = Selling price

Cost price × (100 – Loss %)/100 = Selling price

Calculation:

Cost price of bulb for Nirmal = Selling Price of bulb for Shopkeeper

⇒ Cost price of bulb for Nirmal = (630 × 100)/(100 – 10) = Rs. 700

Selling Price of bulb for Shopkeeper = Rs. 700

⇒ Cost price of bulb for shopkeeper = (700 × 100)/(100 + 40) = Rs. 500

∴ Cost price of the bulb is Rs. 500.

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