Pricing strategy (discounts, coupons) in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply a fixed discount to the original price.

LLD

final_price = original_price - [1]

Drag options to blanks, or click blank then click option'

Adiscount_amount

Bdiscount_rate

Ccoupon_code

Dtax_amount

Attempts:

3 left

💡 Hint

Common Mistakes

Using discount_rate instead of discount_amount

Subtracting tax_amount instead of discount

The fixed discount amount should be subtracted from the original price to get the final price.

2fill in blank

medium

Complete the code to calculate the discount amount from a percentage rate.

LLD

discount_amount = original_price * [1]

Drag options to blanks, or click blank then click option'

Afinal_price

Bcoupon_code

Cdiscount_rate

Dtax_rate

Attempts:

3 left

💡 Hint

Common Mistakes

Using coupon_code instead of discount_rate

Multiplying by tax_rate by mistake

The discount amount is calculated by multiplying the original price by the discount rate (percentage as a decimal).

3fill in blank

hard

Fix the error in the code to apply a coupon discount only if the coupon is valid.

LLD

if coupon.is_valid():
    final_price = original_price - [1]

Drag options to blanks, or click blank then click option'

Acoupon.discount_amount

Btax_amount

Cdiscount_rate

Dcoupon_code

Attempts:

3 left

💡 Hint

Common Mistakes

Using coupon_code string instead of discount_amount

Subtracting tax_amount by mistake

Use the discount amount associated with the coupon object to subtract from the original price.

4fill in blank

hard

Fill both blanks to calculate the final price after applying a percentage discount and adding tax.

LLD

discount_amount = original_price * [1]
final_price = (original_price - discount_amount) * (1 + [2])

Drag options to blanks, or click blank then click option'

Adiscount_rate

Btax_rate

Cdiscount_amount

Dcoupon_code

Attempts:

3 left

💡 Hint

Common Mistakes

Using coupon_code instead of discount_rate

Adding tax before subtracting discount

First calculate discount_amount using discount_rate, then add tax by multiplying with (1 + tax_rate).

5fill in blank

hard

Fill all three blanks to create a dictionary of coupons with their discount rates, filtering only those above 10%.

LLD

coupons = {code: [1] for code, [2] in all_coupons.items() if [3] > 0.1}

Drag options to blanks, or click blank then click option'

Adiscount_rate

Dcoupon_code

Attempts:

3 left

💡 Hint

Common Mistakes

Using coupon_code as value

Filtering by code instead of discount_rate

Use discount_rate as the value, iterate over code and discount_rate, and filter where discount_rate is greater than 10%.