Answer 1

because computers work in binary and in binary you can't represent 1.1, so the computer uses the next best thing an estemate (don't know how it's spelled😅)
in our usual number system you can't represent 1/3 so an estemate would be 0.3333
To work around this error you can round the result.
hope this helped you! 😇

Answer 2

In addition to the previous answer, you can also get around this by changing 1.1 to a fraction (i.e. 11/10) so 50 * 11/10 comes out as 55.0.