Database calculations are wrong

Question

Here is what I\'m setting:

result = price / (case when tax = 0 then @tax1h / 100 else @tax2 / 100 end + 1)

These are the values:

Answer 1

Integer division:

select (6 / 100 + 1)

The result of the above is 1.

However, the result of:

select (6 / 100.0 + 1)

Is 1.06.