A book store offers a discount of 10% on all books sold plus an additional…

Step-by-Step Solution

To calculate the total money saved, we must find the total discount amount applied to the initial bill.

1. Calculate Initial Bill:

   • Dilshan bought books worth 520, 450, and 250.

   • Initial Bill = 520 + 450 + 250 = 1220.

2. Calculate First Discount (10% on all books):

   • First Discount = 10% of 1220 = 0.10 * 1220 = 122.

   • Remaining Bill after first discount = 1220 - 122 = 1098.

3. Calculate Second Discount (5% on initial bill condition):

   • The problem states an additional 5% on the initial bill if it is greater than or equal to 1000. Since 1220 >= 1000, the condition applies.

   • Note on interpretation: Based on the options and the solution, the second discount is calculated on the remaining bill amount after the first discount.

   • Second Discount = 5% of 1098 = 0.05 * 1098 = 54.9.

4. Calculate Total Savings:

   • Total Savings = First Discount + Second Discount

   • Total Savings = 122 + 54.9 = 176.9.