Solve the programming task below in a Python markdown code block.
In a coding contest, there are prizes for the top rankers. The prize scheme is as follows:

Top 10 participants receive rupees X each.
Participants with rank 11 to 100 (both inclusive) receive rupees Y each.

Find the total prize money over all the contestants.

------ Input Format ------ 

- First line will contain T, number of test cases. Then the test cases follow.
- Each test case contains of a single line of input, two integers X and Y - the prize for top 10 rankers and the prize for ranks 11 to 100 respectively.

------ Output Format ------ 

For each test case, output the total prize money over all the contestants.

------ Constraints ------ 

$1 ≤ T ≤ 1000$
$1 ≤ Y ≤ X ≤ 1000$

----- Sample Input 1 ------ 
4
1000 100
1000 1000
80 1
400 30

----- Sample Output 1 ------ 
19000
100000
890
6700

----- explanation 1 ------ 
Test Case $1$: Top $10$ participants receive rupees $1000$ and next $90$ participants receive rupees $100$ each. So, total prize money $= 10 \cdot 1000 + 90 \cdot 100 = 19000$.

Test Case $2$: Top $10$ participants receive rupees $1000$ and next $90$ participants receive rupees $1000$ each. So, total prize money $= 10 \cdot 1000 + 90 \cdot 1000 = 100000$.

Test Case $3$: Top $10$ participants receive rupees $80$ and next $90$ participants receive rupee $1$ each. So, total prize money $= 10 \cdot 80 + 90 \cdot 1 = 890$.

Test Case $4$: Top $10$ participants receive rupees $400$ and next $90$ participants receive rupees $30$ each. So, total prize money $= 10 \cdot 400 + 90 \cdot 30 = 6700$.