Answer:
His gain is 0.5%
Explanation:
* Lets explain how to solve the problem
- The price of the laptop is 40000
- The profit on laptop is 8%
∵ Profit = Cost price × percentage of the profit
∵ Cost price = 40000
∵ Percentage of the profit = 8%
∴ Profit = 40000 × 8/100 = 3200
- The price of the mobile phone is 24000
- The loss on mobile phone is 12%
∵ Loss = Cost price × percentage of the loss
∵ Cost price = 24000
∵ Percentage of the loss = 12%
∴ Loss = 24000 × 12/100 = 2880
- Lets calculate the selling price of the laptop
∵ The selling price of the laptop = cost price + profit
∵ Cost price is 40000 and profit is 3200
∴ the selling price of laptop = 40000 + 3200 = 43200
- Lets calculate the selling price of the mobile phone
∵ The selling price of the mobile phone = cost price - loss
∵ Cost price is 24000 and loss is 2880
∴ the selling price of mobile phone = 24000 - 2880 = 21120
- Now lets find the total cost and the total selling prices
∵ The total cost = the cost of laptop + cost of mobile phone
∵ The cost of laptop is 40000 and the cost of mobile phone is 24000
∴ The total cost price = 40000 + 24000 = 64000
∵ The selling price of laptop is 43200 and the selling price of mobile
phone is 21120
∴ The total selling price = 43200 + 21120 = 64320
- If the selling price is greater than the cost price, then he's gain but
If the selling price is smaller than the cost price, then he's loss
∵ The selling price is 64320 and the cost price is 64000
∴ The selling price > cost price
∴ He is gain
∵ The gain % = (gain ÷ cost price) × 100%
∵ The gain = 64320 - 64000 = 320
∴ The gain % = (320 ÷ 64000) × 100% = 0.5%
* His gain is 0.5%