Time limit 4000/7000/7000/7000 ms. Memory limit 65000/65000/65000/65000 Kb.
Prepared by Ibrahim Mesecan.
Total Discount Rate
Mr. Dardani has a wholesale company. He frequently makes discounts of different rates according to
several different criteria. He records all his sales in a file. In the file he keeps the actual prices
and the discount rate. At the end of every month, he wants to see the total discount rate, which
is calculated with the following formula
totalDiscountRate = 100 - (Total Sale Price) / (Sum of Actual Price) * 100;
Write a program that is going to read all sale and discount information and then calculate the
totalDiscountRate out of gross sale amount.
Input specification
There will be n lines of sale information. Every line will contain 2
float numbers (saleAmount and discountRate),
where 1 ≤ n ≤ 10000, 0 ≤ saleAmount ≤ 10000 and 1 ≤
discountRate ≤ 100
- saleAmount is the amount of the sale before discount
- discountRate is the percentage of the discount
Output specification
Show one floating point number that gives the total discountRate.
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Sample Input:
3
100 7
150 10
200 5
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Sample Output:
7.111
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Output Explanation :
| Item Nr. |
Actual Price |
Sale Price |
| 1 |
100 |
93 |
| 2 |
150 |
135 |
| 3 |
200 |
190 |
| |
Sum of Actual Price |
Total Sale Price |
| |
450 |
418 |
Для отправки решений необходимо выполнить вход.
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