Explanation

To find the markup (interest), we can use the formula:

Interest = Principal * Rate * Time

Given:

Principal = Rs. 45,000

Rate = 10% per annum = 0.10

Time = 73 days / 365 days (convert to years)

Time in years = 73/365

Interest = 45000 * 0.10 * (73/365)

= 45000 * 0.10 * 0.2

= 900

Explanation

Discount percentage = (Discount / Original Price) * 100

Discount = Rs. 2.50

Original Price = Rs. 50

Discount percentage = (2.50 / 50) * 100

= 5%

Explanation

Let's find the purchase price (cost price):

Selling price = Rs 25,000

Loss percentage = 20%

Let the cost price be x.

Since Naeem suffered a 20% loss:

Selling price = Cost price - Loss

25,000 = x - 0.20x

25,000 = 0.80x

Divide both sides by 0.80:

x = 25,000 / 0.80

x = 31,250

Explanation

 Decrease = 25,000 - 24,500 = 500

Percentage decrease = (500 / 25,000) × 100 = 2%

Explanation

1/50 = 2/100

= 2%