Final answer:
To calculate the total amount the customer pays for the article costing Rs. 900 with a 13% VAT, multiply the price by the VAT rate in decimal form (0.13) and add the result to the original price. The customer pays a total of Rs. 1017.
Step-by-step explanation:
To find the total amount the customer pays for an article costing Rs. 900 with a 13% VAT, you need to calculate the tax amount and add it to the original price. To convert the percentage to a decimal form, you would divide the VAT rate by 100. In this case, 13% becomes 0.13. Now, multiply the original price by the decimal VAT rate:
900 × 0.13 = Rs. 117
Next, add the VAT amount to the original price:
900 + 117 = Rs. 1017
The customer will pay a total of Rs. 1017, therefore the correct answer is: a) Rs. 1017