At the local grocery store items are sold by quantity. For example, Milk costs $3.97. However, sometimes there is a sale and then consumers can buy n items for the price of one.
This week the pricing table at the local grocery store looks like this.
| Item | Unit price | Sale price |
|---|---|---|
| Milk | $3.97 | 2 for $5.00 |
| Bread | $2.17 | 3 for $6.00 |
| Banana | $0.99 | |
| Apple | $0.89 |
At the cash counter, the items are accepted in any order. For example, at the cash counter, the order of items can be Bread, Banana, Milk, Apple, Bread, and then Milk. Notice that the quantity of the Milk is 2 and this week there is a sale on Milk if 2 milk is purchased. So the price applied for milk should be $5.00.
Note that if the user buys three milk then
- for the first two milk user should pay the sale price
- for the third milk user should pay the unit price.
So the total price for three milk will be $5.00 + $3.97 = $8.97
Task
The task is to build a ruby program which when executed would ask the user to list all the items purchased in any order. Once the user has listed all the items then print the total cost.
Put all the code of this challenge in a directory called price_calculator_challenge.
You need to build a solution for the given items and you do not need to worry about items that would be added in the future -- in other words, the pricing table is static.
$ ruby price_calculator.rb
Please enter all the items purchased separated by a comma
milk,milk, bread,banana,bread,bread,bread,milk,apple
Item Quantity Price
--------------------------------------
Milk 3 $8.97
Bread 4 $8.17
Apple 1 $0.89
Banana 1 $0.99
Total price : $19.02
You saved $3.45 today.Put all the code of this challenge in a directory called price_calculator_challenge.
We should be able to execute code like this.
$ ruby price_calculator_challange/solution.rb