Water Consumption Cost Calculation

You are given the water consumption (in cubic meters) and the base rate per cubic meter for a household. Your task is to calculate the total cost for the water consumption. If the consumption exceeds 500 cubic meters, an additional surcharge of 5% of the basic cost is applied.

The total cost is calculated as follows:

$$\text{total_cost} = \begin{cases} consumption \times base\_rate, & \text{if } consumption \leq 500,\\ consumption \times base\_rate \times 1.05, & \text{if } consumption > 500. \end{cases} $$

Output the total cost rounded to two decimal places for each test case.

inputFormat

The first line contains an integer T representing the number of test cases. Each of the next T lines contains two space-separated integers — consumption and base_rate.

outputFormat

For each test case, output a single line with the calculated total cost, rounded to two decimal places.

## sample

3
400 2
600 3
500 5

800.00
1890.00
2500.00

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