## NITK04 - DEEPIKA AND HER BANK ACCOUNT

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Ranbir has deposited some money in Deepika's account. Deepika would like to withdraw X \$US from an ATM. The ATM machine will only accept the transaction if X is a multiple of 10, and Deepika's account balance has enough cash to perform the withdrawal transaction (including bank charges). For each successful withdrawal the bank charges 0.50 \$US.

Calculate Deepika's account balance after an attempted transaction.

### Input

The first like contains T ( T<20), the number of Test cases followed by T line containing X and Y each.

Positive integer 0 < X <= 2000 - the amount of cash which Deepika wishes to withdraw.

Nonnegative number 0<= Y <= 2000 with two digits of precision - Deepika's initial account balance.

### Output

Output the account balance after the attempted transaction, given as a number with two digits of precision. If there is not enough money in the account to complete the transaction, output the current bank balance.

### Example

```Input:
230 120.00
42 120.00

Output: 89.50 120.00```

 Added by: Gaurav Jain Date: 2013-09-25 Time limit: 1s Source limit: 50000B Memory limit: 1536MB Cluster: Cube (Intel G860) Languages: All except: ASM64 Resource: CodeChef