Incorrect Calculation for Trade.minimumAmountOut

[Jdecristi]

The math for the Trade.minimumAmountOut() is wrong. This is an issue in the interface because the Minimum output in the SwapDetailsDropdown is showing the wrong number.

Steps to Reproduce

1. Go to app.uniswap.org
2. Add two tokens to swap (Easier to test with two stablecoins like USDC & DAI)
3. Add Custom Slippage (Easier to test with a round number like 50%)
4. Open SwapDetailsDropdown see the incorrect number in the "Minimum output" row

Expected Behavior

Trade.minimumAmountOut() method should correctly calculate the slippage

Additional Context

In the screenshot the Minimum output is 666.604 when it should be 499.953.